Product Description

The SOUL Competition Headers are a direct bolt-on performance upgrade for the 1999–2004 Porsche 996 Carrera, replacing the restrictive factory exhaust manifolds with equal-length T304L stainless-steel runners and true 3-into-1 merge collectors.

Unlike many products carrying the “Competition” name, these headers do not remove the catalytic converters. On the 996 Carrera, Porsche locates the catalysts farther downstream in the rear exhaust assemblies, allowing SOUL to focus entirely on improving exhaust flow between the cylinder heads and the existing catalyst section.

SOUL improves the factory flow path with port-matched flanges, smooth-radius large-diameter primary tubes, equal-length runners, and a collector that gives each cylinder a more effective path into a true 3-to-1 merge. The factory manifolds do not use the same true merge-collector architecture.

The result is improved exhaust flow, stronger throttle response, and noticeably greater torque under acceleration without requiring removal of the vehicle's catalytic converters or changing the basic emissions architecture.

SOUL also designed the headers with increased internal volume to better support the later 3.6L 996 Carrera engines, while retaining compatibility across the complete naturally aspirated 996 Carrera range.

FITMENT:

• Fits 1999–2004 Porsche 996 911 Carrera

• Fits 1999–2004 Porsche 996 911 Carrera Cabriolet

• Fits 1999–2004 Porsche 996 911 Carrera 4

• Fits 1999–2004 Porsche 996 911 Carrera 4 Cabriolet

• Fits 2002–2004 Porsche 996 911 Carrera 4S

• Fits 2004 Porsche 996 911 Carrera 4S Cabriolet

• Fits applicable 2002–2004 Porsche 996 911 Targa

• Compatible with 996.1 and 996.2 Carrera

• Compatible with naturally aspirated 3.4L and 3.6L Carrera engines

• Compatible with the factory catalytic-converter assemblies

• Compatible with SOUL Sport Catalytic Converters

• Compatible with SOUL Cat Bypass Pipes

• Compatible with SOUL 996 X-Pipe configurations

• Compatible with factory or appropriate SOUL rear mufflers

• Does not fit 996 Turbo, GT2, or GT3 applications

DETAILS:

• Pair of performance Competition Headers

• Equal-length primary runners

• True 3-into-1 merge collectors

• Improves on the factory manifold's non-merge collector architecture

• Port-matched cylinder-head flanges

• Smooth flange-to-primary transitions

• Smooth-radius primary tubing

• Large-diameter primary bends

• Equalized collector inputs from all three cylinders

• Increased internal volume for later 3.6L applications

• Designed to improve exhaust flow

• Designed to increase usable torque and response

• Retains downstream catalytic converters when used with the factory exhaust

• Does not require catalyst removal

• Does not inherently alter oxygen-sensor or catalyst-monitoring architecture

• T304L stainless-steel construction

• Direct bolt-on installation

• Approximately 2 lbs / 0.9 kg lighter than the corresponding factory header components

• Fixture-tested before shipment

• Foam-packed after quality control

• Detailed installation instructions included

• No product variants

• Backed by SOUL Performance Products' Lifetime Warranty for street and track use

TRUE 3-INTO-1 MERGE COLLECTORS

One of the most significant differences between the factory manifolds and the SOUL Competition Headers is the collector design.

Each bank of Porsche's flat-six must combine three individual exhaust runners into a single outlet.

The original manifolds do not use what SOUL considers a true:

3-into-1 merge collector

SOUL redesigns this area so that each primary runner feeds the collector more evenly.

The goal is to create a smoother transition from:

Cylinder Head → Primary Runner → Merge Collector → Downstream Exhaust

rather than forcing the gases through the less optimized factory junction.

EQUAL-LENGTH PRIMARY RUNNERS

SOUL uses equal-length runners to provide a more consistent path from each cylinder to the collector.

This architecture is intended to improve how the exhaust pulses from all three cylinders on each bank enter the collector.

The design focuses on:

• Consistent exhaust routing

• Improved collector entry

• Smoother exhaust flow

• Better utilization of exhaust pulse energy

• Increased performance potential

PORT-MATCHED FLANGES

The transition immediately after the cylinder head is an important part of header design.

SOUL uses port-matched flanges to create a cleaner interface between the cylinder-head exhaust ports and the primary tubes.

An abrupt step or poorly matched transition can create unnecessary turbulence at the beginning of the exhaust path.

SOUL instead focuses on smoothing the transition from the flange into the primary runners.

SMOOTH FLANGE-TO-PRIMARY TRANSITION

The SOUL design specifically addresses the interface between:

Flange → Primary Tube

This area is optimized to reduce abrupt changes in geometry as the exhaust gases leave the cylinder head.

The objective is a cleaner path through the entire manifold rather than simply using larger tubing.

SMOOTH-RADIUS PRIMARY TUBING

SOUL uses smooth-radius bends through the primary runners rather than abrupt exhaust routing.

This helps maintain:

• Consistent internal geometry

• Exhaust velocity

• Smooth directional changes

• Reduced localized restriction

The result is a more carefully controlled exhaust path before the gases reach the collector.

DESIGNED FOR BOTH 3.4L AND 3.6L ENGINES

The 996 Carrera platform spans both:

3.4L

and

3.6L

naturally aspirated flat-six engines.

SOUL specifically notes that its header design provides greater internal volume for the 3.6L applications while remaining compatible across the 1999–2004 Carrera platform.

This allows one header design to serve the complete naturally aspirated 996 Carrera family.

IMPROVED EXHAUST FLOW

The factory 996 Carrera manifolds leave room for improvement in several areas:

• Primary-runner transition

• Bend geometry

• Collector design

• Collector entry from each cylinder

SOUL addresses all of these areas simultaneously.

Rather than focusing on one oversized pipe dimension, the system improves the complete path from the cylinder head into the downstream exhaust.

STRONGER TORQUE RESPONSE

SOUL specifically describes the Competition Headers as producing noticeably more torque when the throttle is applied.

This makes sense as a header-focused modification because the goal is not simply maximum peak horsepower at redline.

Improving exhaust flow can also affect:

• Midrange response

• Part-throttle response

• Engine willingness to rev

• Acceleration throughout the usable RPM range

SOUL does not publish a numerical torque gain, so DasMotoring does not assign a specific lb-ft figure to the headers.

NO PUBLISHED DYNO NUMBER

The current SOUL product page does not provide a controlled factory-header versus Competition-Header dyno chart.

SOUL describes increased exhaust flow, stronger torque, and increased power potential, but does not publish a verified:

• Peak horsepower gain

• Peak torque gain

• RPM-specific gain

DasMotoring therefore does not advertise a numerical horsepower or torque increase for this product.

RETAINS THE CATALYTIC CONVERTERS

The term Competition Headers can easily create the impression that this is a catless product.

It is not.

On the 996 Carrera, the catalytic converters are incorporated farther downstream in the rear exhaust system.

The headers themselves replace only the original exhaust manifolds.

When installed with the original rear exhaust, the vehicle retains:

• Factory catalytic converters

• Factory catalyst monitoring

• Downstream emissions hardware

• Factory mufflers

This makes the headers fundamentally different from SOUL's:

• Cat Bypass Pipes

• Competition X-Pipe

both of which can remove the catalytic converters.

NO CATALYST-RELATED CEL EXPECTED FROM THE HEADERS

Because the Competition Headers do not remove the catalytic converters or alter the catalyst-monitoring architecture, SOUL specifically developed the system without introducing check-engine-light issues associated with catalyst deletion.

This does not mean that no 20+ year-old vehicle can ever produce a diagnostic fault, but there is no catalyst-delete mechanism inherent to the header installation itself.

NO ECU TUNE REQUIRED

SOUL does not specify ECU calibration as a requirement for installation.

The headers are designed as a mechanical bolt-on upgrade.

A tune may potentially extract additional benefit when combined with other engine modifications, but it is not necessary simply to install the headers.

WITH FACTORY CATALYTIC CONVERTERS

The simplest configuration is:

SOUL Competition Headers + Factory Catalysts + Factory Rear Exhaust

This provides:

• Improved header flow

• True 3-into-1 merge collectors

• Reduced header weight

• Retained factory catalysts

• Retained factory mufflers

• Comparatively subtle sound change

For a customer primarily interested in improving engine response without dramatically increasing exhaust volume, this is a logical first-stage configuration.

WITH SOUL SPORT CATALYTIC CONVERTERS

Pairing the Competition Headers with the SOUL Sport Catalytic Converters creates a more comprehensive performance exhaust configuration.

The combination addresses:

Headers:
Flow immediately after the cylinder heads

and

Sport Catalytic Converters:
Restriction farther downstream in the catalyst section

This provides:

• Improved manifold flow

• High-flow catalysts

• Increased flat-six sound

• Reduced exhaust restriction

• Greater overall performance potential

while retaining catalytic converters.

WITH SOUL CAT BYPASS PIPES

For a more aggressive configuration, the headers can be paired with SOUL Cat Bypass Pipes.

This combines:

• Equal-length headers

• True 3-to-1 merge collectors

• Catless split-bank catalyst replacement

• Reduced exhaust restriction

• Greater flat-six volume

• Increased exhaust character

The emissions and CEL considerations in this configuration are created by the Cat Bypass Pipes, not by the Competition Headers themselves.

WITH SOUL X-PIPE

The Competition Headers are also compatible with SOUL's larger 996 X-Pipe architecture.

Depending on the selected X-Pipe configuration, the customer can choose:

• Catted X-Pipe

• Catless Competition X-Pipe

This gives the owner considerable flexibility in building the rest of the exhaust downstream from the headers.

WITH FACTORY REAR MUFFLERS

Because the headers do not require a rear exhaust replacement, they can be installed while retaining the factory mufflers.

This configuration maintains the greatest amount of Porsche's original sound attenuation.

Any sound increase from the headers themselves should therefore remain significantly more restrained than changes produced by replacing the catalyst or rear muffler sections.

WITH SOUL SPORT SIDE MUFFLERS

Combining the Competition Headers with SOUL Sport Side Mufflers further increases naturally aspirated flat-six character while retaining SOUL's proprietary drone-control strategy.

A full street-oriented SOUL configuration can therefore combine:

Competition Headers

Sport Catalytic Converters

Sport Side Mufflers

for improvements throughout the exhaust system without requiring a completely catless configuration.

2-LB WEIGHT REDUCTION

SOUL specifies that the Competition Headers weigh approximately:

2 lbs / 0.9 kg less

than the corresponding factory components.

SOUL does not currently publish the individual absolute weights of:

• Factory headers

• SOUL Competition Headers

so DasMotoring does not invent or extrapolate those figures.

T304L STAINLESS-STEEL CONSTRUCTION

The Competition Headers are fabricated from:

T304L stainless steel

This material provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Long service life

• Suitability for repeated street and track heat cycling

SOUL does not currently publish a wall thickness for this product, so DasMotoring does not assign one.

FIXTURE-TESTED FITMENT

Each set of Competition Headers is tested in a dedicated manufacturing fixture before shipment.

This helps verify:

• Cylinder-head flange alignment

• Primary-runner positioning

• Collector alignment

• Downstream exhaust fitment

• Overall dimensional consistency

Each set is then quality inspected and foam packed before shipment.

DIRECT BOLT-ON INSTALLATION

SOUL describes these headers as one of the easier performance upgrades available for the 996 Carrera.

The system is designed as a direct bolt-on replacement for the original manifolds.

SOUL includes detailed installation instructions, and no permanent chassis modification is required for normal installation.

COMPETITION HEADERS VS. FACTORY HEADERS

Factory Headers

• Non-optimized collector architecture

• No true 3-into-1 merge collector

• Less optimized flange-to-primary transition

• Factory exhaust flow characteristics

• Approximately 2 lbs heavier

SOUL Competition Headers

• Equal-length runners

• True 3-into-1 merge collectors

• Port-matched flanges

• Smooth-radius primary tubing

• More equal collector inputs

• Increased internal volume for 3.6L applications

• Approximately 2 lbs lighter

• Retains downstream catalyst compatibility

COMPETITION DOES NOT MEAN CATLESS

Within the SOUL 996 catalog, the naming can be confusing.

Competition Headers

do not remove the catalytic converters.

By contrast:

Competition X-Pipe

is the catless X-pipe configuration.

The Competition Header name refers to the performance-oriented manifold design, not catalyst deletion.

This distinction is important when building a complete DasMotoring exhaust package.

Product Description

The SOUL Cat Bypass Pipes are a direct-fit, completely catless performance upgrade for the 1999–2004 Porsche 996 Carrera, replacing the restrictive factory catalytic-converter assemblies with lightweight 2.25-inch T304L stainless-steel bypass pipes.

SOUL developed these pipes with particular attention to the naturally aspirated 996's exhaust character. Rather than joining the left and right cylinder banks with an X-pipe, SOUL deliberately uses a split-bank design after back-to-back testing showed that keeping the banks separated preserved more of the deep frequencies and distinctive character of Porsche's flat-six.

The result is substantially increased exhaust volume, a deeper and fuller flat-six tone, additional rasp, improved throttle response, and a rawer exhaust character that SOUL describes as having a hint of an air-cooled Porsche sound.

At approximately 8.75 lbs, the SOUL Cat Bypass Pipes are approximately 6.25 lbs / 2.8 kg lighter than the roughly 15-lb factory catalytic-converter assemblies they replace.

FITMENT:

• Fits 1999–2004 Porsche 996 911 Carrera

• Fits 1999–2004 Porsche 996 911 Carrera Cabriolet

• Fits 1999–2004 Porsche 996 911 Carrera 4

• Fits 1999–2004 Porsche 996 911 Carrera 4 Cabriolet

• Fits 2002–2004 Porsche 996 911 Carrera 4S

• Fits 2004 Porsche 996 911 Carrera 4S Cabriolet

• Fits 2002–2004 Porsche 996 911 Targa

• Compatible with both 996.1 and 996.2 Carrera

• Fits applicable 3.4L and 3.6L naturally aspirated Carrera engines

• Compatible with the factory rear mufflers

• Compatible with SOUL Sport Side Mufflers where applicable

• Compatible with Carrera 4S-specific SOUL rear mufflers

• Does not fit 996 Turbo, GT2, or GT3

DETAILS:

• Pair of completely catless Cat Bypass Pipes

• Replaces both factory catalytic-converter assemblies

• Split-bank exhaust architecture

• Left and right cylinder banks remain separated

• Specifically developed after comparison testing against an X-pipe configuration

• Designed for a deeper, fuller 996 flat-six exhaust tone

• Increased overall exhaust volume

• Additional exhaust rasp and mechanical character

• Increased throttle response

• Improved overall drivability

• Increased performance potential

• 2.25-inch outside-diameter tubing

• .065-inch wall thickness

• T304L stainless-steel construction

• Smooth mandrel bends

• Thick exhaust flanges

• New header-flange hardware included

• Approximately 8.75 lbs / 4.0 kg

• Factory components approximately 15 lbs / 6.8 kg

• Saves approximately 6.25 lbs / 2.8 kg

• Approximately 42% lighter than the factory catalyst assemblies

• Fixture-tested prior to shipment

• Foam-packed following quality inspection

• May trigger a catalyst-related check engine light

• Designed and manufactured in Willow Grove, Pennsylvania

• No product variants

• Backed by SOUL Performance Products' Lifetime Warranty for street and track use

COMPLETE CATALYTIC-CONVERTER DELETE

The SOUL Cat Bypass Pipes completely eliminate the original Porsche catalytic converters.

The factory catalysts create a significant restriction in the 996 Carrera exhaust system while also absorbing a considerable amount of the naturally aspirated flat-six's sound.

SOUL replaces these assemblies with unrestricted stainless-steel pipes.

The result provides:

• Reduced exhaust restriction

• Increased exhaust-flow capacity

• Greater flat-six sound

• Increased throttle response

• Reduced exhaust-system weight

• Greater performance potential

The tradeoff is that the vehicle no longer retains catalytic converters.

SPLIT-BANK EXHAUST DESIGN

One of the most interesting aspects of this product is SOUL's decision not to use an X-pipe.

The left and right cylinder-bank exhaust streams remain separate through the catalyst-replacement section.

SOUL specifically tested:

Split-Bank Pipes

against:

X-Pipe Architecture

during development.

The company ultimately preferred the sound produced by keeping the two banks independent.

WHY SOUL CHOSE SPLIT BANKS

During back-to-back testing, SOUL found that an X-pipe changed the sound of the 996 in a way it did not prefer.

The X-pipe produced a more blended and comparatively hollow tone while reducing some of the deeper exhaust frequencies.

Separating the banks instead produced:

• Greater volume

• Deeper exhaust frequencies

• Fuller flat-six tone

• Increased individual-bank character

• A slight additional rasp

• More mechanical exhaust texture

SOUL ultimately selected the split-bank architecture for the production Cat Bypass Pipes.

DEEPER, FULLER FLAT-SIX SOUND

The 996 Carrera's naturally aspirated flat-six is especially responsive to changes in the catalyst section.

Removing the original catalysts allows considerably more of the engine's exhaust character to reach the rear mufflers.

Expect:

• Louder cold starts

• Greater idle presence

• Increased acceleration sound

• Deeper midrange exhaust tone

• Stronger high-RPM presence

• Increased throttle-related sound

• Additional exhaust rasp

• Greater deceleration character

The final sound level depends heavily on the rear mufflers installed behind the Cat Bypass Pipes.

AIR-COOLED-INSPIRED CHARACTER

SOUL describes the split-bank Cat Bypass configuration as having a slight:

air-cooled-inspired exhaust character

due to the combination of:

• Deeper frequencies

• Independent exhaust banks

• Increased mechanical character

• Additional rasp

• Reduced sound attenuation

This does not mean a 996 becomes acoustically identical to an air-cooled 911, but it describes the direction SOUL pursued when developing the system.

IMPROVED THROTTLE RESPONSE

SOUL specifically identifies improved:

throttle response

and:

overall drivability

as benefits of the Cat Bypass Pipes.

Reducing restriction in the catalyst section allows the naturally aspirated engine to move exhaust gases more freely.

For the driver, SOUL characterizes the result as a more immediate and responsive feel in addition to the increased sound.

PERFORMANCE POTENTIAL

Removing the restrictive factory catalytic converters increases available exhaust-flow capacity.

This can become especially useful when the vehicle also has:

• ECU tuning

• Intake modifications

• Headers

• Performance rear mufflers

• Other naturally aspirated engine modifications

However, SOUL does not publish a controlled before-and-after dyno result for the Cat Bypass Pipes alone.

DasMotoring therefore does not advertise a specific numerical horsepower or torque gain.

WITH FACTORY SIDE MUFFLERS

The Cat Bypass Pipes can be installed while retaining Porsche's original rear mufflers.

This provides the most conservative catless configuration.

Expect:

• Significantly increased engine character

• Deeper exhaust tone

• Increased throttle response

• More high-RPM sound

• Retained factory rear muffler attenuation

• OEM rear appearance

For a customer wanting substantially more sound without replacing every exhaust component at once, this is the logical starting point.

WITH SOUL SPORT SIDE MUFFLERS

The Cat Bypass Pipes can also be combined with SOUL's Sport Side Mufflers.

The result provides:

• Catless catalyst section

• Increased flat-six sound

• Greater overall volume

• Stronger high-RPM character

• SOUL's proprietary drone-fighting rear mufflers

• Reduced overall exhaust restriction

Because SOUL's Sport Side Mufflers retain significant acoustic control, they can help keep the complete system more manageable than a muffler-delete configuration.

CARRERA 4S COMPATIBILITY

The Cat Bypass Pipes fit the 996 Carrera 4S.

This is important because the standard narrow-body 996 Sport Side Mufflers specifically do not fit the C4S.

The catalyst section is shared, while the rear exhaust architecture differs.

For a Carrera 4S:

SOUL Cat Bypass Pipes: compatible

Standard Carrera Sport Side Mufflers: not compatible

C4S-specific SOUL Side Mufflers: required when upgrading the rear mufflers

TARGA COMPATIBILITY

The same Cat Bypass Pipe assembly also applies to the naturally aspirated 996 Targa.

This makes POR.996.CBP a shared catalyst-delete component across the naturally aspirated Carrera family rather than a body-style-specific exhaust component.

2.25-INCH TUBING

SOUL constructs each bypass assembly from:

2.25-inch outside-diameter tubing

This differs from the 2.5-inch architecture used by SOUL's separate 996 X-Pipe product.

That distinction is important when comparing the two systems.

The Cat Bypass Pipes prioritize SOUL's preferred split-bank sound architecture, while the X-Pipe uses a larger combined-flow design with a different acoustic character.

.065-INCH-WALL T304L STAINLESS STEEL

The pipes are constructed from:

.065-inch-wall T304L stainless steel

This material provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Low component weight

• Long service life

• Suitability for repeated street and track heat cycles

MANDREL-BENT TUBING

SOUL uses smooth mandrel bends to preserve the internal tubing geometry through changes in direction.

Maintaining consistent cross-sectional area helps prevent unnecessary restrictions and supports predictable exhaust flow.

THICK EXHAUST FLANGES

The Cat Bypass Pipes use substantial exhaust flanges designed to maintain:

• Proper sealing

• Correct alignment

• Structural rigidity

• Durability during repeated thermal cycling

This is especially relevant on vehicles that may now have more than two decades of heat cycling on their original exhaust hardware.

NEW HEADER-FLANGE HARDWARE

SOUL includes new hardware for the connection between the Cat Bypass Pipes and the headers.

This avoids requiring the installer to reuse all of the original aged fasteners at that interface.

Existing downstream exhaust hardware should still be inspected during installation and replaced where necessary.

FIXTURE-TESTED FITMENT

Each set is tested in a dedicated production fixture before shipment.

SOUL verifies:

• Flange positioning

• Pipe geometry

• Downstream exhaust alignment

• Overall dimensional consistency

The completed assemblies then undergo quality control and are foam packed for shipping.

6.25-LB WEIGHT REDUCTION

SOUL publishes:

Factory Catalytic Converter Assemblies:
approximately 15 lbs / 6.8 kg

SOUL Cat Bypass Pipes:
approximately 8.75 lbs / 4.0 kg

Weight Savings:
approximately 6.25 lbs / 2.8 kg

That represents approximately a:

42% reduction

in the mass of the factory catalyst assemblies being replaced.

The weight is also removed from the rear of a rear-engined 911.

CAT BYPASS VS. SPORT CATALYTIC CONVERTERS

SOUL Cat Bypass Pipes

• $1,555

• Completely catless

• Split-bank design

• 2.25-inch T304L construction

• Approximately 8.75 lbs

• Saves 6.25 lbs

• Maximum catalyst-section volume

• Greater raw exhaust character

• Potential catalyst-related CEL

• Competition-oriented configuration

SOUL Sport Catalytic Converters

• $3,055

• Retain high-flow catalysts

• Split-bank design

• Approximately 13 lbs

• Saves 2 lbs

• Developed for catalyst-related CEL-free operation

• Reduced exhaust odor

• More street-oriented configuration

Both products use SOUL's preferred split-bank architecture.

The primary decision is whether the customer wants to retain catalytic converters.

CAT BYPASS VS. COMPETITION X-PIPE

These are not the same product with different names.

Cat Bypass Pipes

• $1,555

• Catless

• Split-bank

• 2.25-inch OD tubing

• Deeper, fuller tone

• 8.75 lbs

• 6.25 lbs saved

Competition X-Pipe

• $1,695

• Catless

• X-pipe

• 2.5-inch architecture

• More blended / hollower sound character

• Current X-Pipe page does not publish a verified weight

The $140 price difference is relatively small.

The more important distinction is sound architecture.

CAT BYPASS VS. CATTED X-PIPE

The same basic choice exists for customers who want to retain catalysts:

Sport Catalytic Converters

use SOUL's deeper-sounding split-bank design.

Catted X-Pipe

uses the 2.5-inch X-pipe architecture.

This makes the 996 SOUL catalog unusually flexible because the customer can independently prioritize:

• Catalyst retention

• Sound character

• Exhaust architecture

rather than simply choosing progressively louder versions of the same basic design.

CHECK ENGINE LIGHT

Because the Cat Bypass Pipes completely remove the original catalytic converters, catalyst-monitoring faults may occur.

SOUL explicitly states that this product:

may trigger a check engine light.

DasMotoring therefore does not advertise the Cat Bypass Pipes as CEL-free.

ECU TUNING

The pipes do not require ECU calibration simply to physically bolt onto the vehicle.

However, catalyst removal may result in diagnostic faults.

SOUL recommends contacting them for a tuning solution when catalyst-related faults need to be addressed on an appropriate competition vehicle.

A performance calibration may also be used as part of a broader naturally aspirated engine build.

NO PUBLISHED DYNO NUMBER

SOUL describes improvements in:

• Sound

• Power

• Throttle response

• Overall drivability

but does not publish a controlled standalone horsepower or torque figure for POR.996.CBP.

DasMotoring therefore does not advertise a specific numerical power gain.

LIFETIME WARRANTY

SOUL backs the fabricated Cat Bypass Pipes with its:

Lifetime Warranty

for both street and track use.

Unlike a catted system, there is no catalytic-converter substrate with a separate shorter catalyst warranty.

EMISSIONS / COMPETITION USE NOTE

The Cat Bypass Pipes completely remove the original catalytic converters.

SOUL states that this product is:

• Not CARB certified

• Potentially illegal for use on emissions-controlled vehicles

• Intended for off-road / competition use only

Customers are responsible for determining whether their vehicle configuration and intended use comply with applicable regulations.

Product Description

The SOUL X-Pipe is a large-diameter performance catalyst-section upgrade for the 1999–2004 Porsche 996 Carrera, available in either a catless Competition configuration or a catted Sport Catalytic Converter configuration.

Unlike SOUL's standalone 996 Sport Catalytic Converters and Cat Bypass Pipes—which deliberately keep the left and right cylinder banks separated—this system uses an X-pipe architecture to merge the opposing exhaust streams.

SOUL builds the X-Pipe around large 2.5-inch-diameter, .065-inch-wall T304L stainless-steel tubing to reduce exhaust restriction and increase the naturally aspirated flat-six's sound and performance potential.

The Competition version removes the factory catalytic converters entirely for maximum flow and a more aggressive exhaust note. The Catted version incorporates SOUL Sport Catalytic Converters for customers who want the X-pipe architecture while retaining catalysts.

FITMENT:

• Fits 1999–2004 Porsche 996 Carrera

• Fits 1999–2004 Porsche 996 Carrera Cabriolet

• Fits 1999–2004 Porsche 996 Carrera 4

• Fits 1999–2004 Porsche 996 Carrera 4 Cabriolet

• Fits 2002–2004 Porsche 996 Carrera 4S

• Fits applicable 996 Carrera Targa models

• Compatible with both 996.1 and 996.2 Carrera

• Compatible with the factory rear mufflers

• Compatible with SOUL Sport Side Mufflers where applicable

• Does not fit 996 Turbo, GT2, or GT3

DETAILS:

• Performance X-Pipe catalyst section

• Available in Competition / Catless

• Available in Catted / Sport Catalytic Converter

• Large 2.5-inch diameter tubing

• .065-inch wall thickness

• T304L stainless-steel construction

• X-pipe joins the left and right cylinder-bank exhaust streams

• Designed to reduce exhaust restriction

• Designed to increase performance potential

• Increases naturally aspirated flat-six sound

• Smooth mandrel-bent tubing

• Thick exhaust flanges

• Fixture-tested before shipment

• Foam-packed after quality inspection

• Direct-fit exhaust architecture

• Two catalyst configurations

• No exhaust-tip variants

• Backed by SOUL Performance Products' Lifetime Warranty for street and track use

LARGE-DIAMETER 2.5-INCH ARCHITECTURE

SOUL builds the 996 Carrera X-Pipe from:

2.5-inch-diameter tubing

The larger flow path is intended to reduce restriction compared with the original Porsche catalyst section and provide additional exhaust capacity for naturally aspirated performance applications.

SOUL specifically developed the system around maximizing flow rather than simply reproducing the dimensions of the factory components.

X-PIPE DESIGN

The defining feature of this product is the connection between the two cylinder banks.

Instead of keeping the left and right exhaust streams completely independent, the X-pipe allows them to merge and interact before continuing toward the rear exhaust.

This changes both:

• Exhaust-flow behavior

• Exhaust sound character

Compared with SOUL's split-bank catalyst products, the X-pipe produces a different tonal balance and exhaust personality.

IMPORTANT SOUND DIFFERENCE VS. SOUL SPLIT-BANK SYSTEMS

SOUL actually tested split-bank and X-pipe designs back-to-back during development of its 996 exhaust components.

Interestingly, SOUL preferred the split-bank layout for its standalone Sport Catalytic Converters and Cat Bypass Pipes because it preserved more of the deep frequencies of the 996 flat-six.

SOUL found that the X-pipe produced a comparatively:

• Smoother sound

• More blended exhaust note

• Hollower tonal character

• Reduced emphasis on some deeper frequencies

That doesn't make one architecture universally better than the other—they simply produce different sound characteristics.

Customers specifically seeking the deepest possible 996 tone may prefer SOUL's split-bank catalyst products, while customers wanting an X-pipe sound and large 2.5-inch flow path should choose this system.

COMPETITION / CATLESS CONFIGURATION

The Competition configuration completely removes the factory catalytic converters.

It combines:

• 2.5-inch piping

• X-pipe architecture

• Catless exhaust flow

This is the most aggressive version of the SOUL X-Pipe.

Expect:

• Maximum catalyst-section flow

• Increased exhaust volume

• More raw flat-six character

• Greater high-RPM presence

• Reduced catalyst restriction

• Increased performance potential

• Stronger exhaust odor

• Potential catalyst-related diagnostic faults

Price: $1,695.00

CATTED CONFIGURATION

The Catted version combines the same X-pipe concept with SOUL's Sport Catalytic Converter configuration.

It retains catalytic converters while offering the larger 2.5-inch X-pipe architecture.

This provides a more conservative alternative for customers who want:

• X-pipe exhaust character

• Increased exhaust flow

• Retained catalysts

• Less exhaust odor than the Competition configuration

• Reduced diagnostic concerns compared with a completely catless setup

Price: $3,195.00

CATTED VS. COMPETITION

Competition X-Pipe

• $1,695

• Completely catless

• 2.5-inch X-pipe

• Maximum flow

• Maximum catalyst-section sound

• Stronger exhaust odor

• Potential catalyst-related CEL

• Competition-oriented

Catted X-Pipe

• $3,195

• Retains Sport Catalytic Converters

• 2.5-inch X-pipe

• More conservative sound and emissions behavior

• Less exhaust odor

• Better suited to customers who want to retain catalysts

Both configurations use the same basic large-diameter X-pipe concept.

X-PIPE VS. SOUL CAT BYPASS PIPES

This is an important distinction within the 996 catalog.

SOUL Cat Bypass Pipes

• Catless

• Left and right banks remain separated

• SOUL specifically selected the split-bank design for a deeper tone

• $1,555

SOUL Competition X-Pipe

• Catless

• Left and right banks are joined through an X-pipe

• More blended exhaust character

• 2.5-inch large-diameter architecture

• $1,695

The difference is therefore not simply price.

The two products use different exhaust architectures and produce different sound characteristics.

X-PIPE VS. SOUL SPORT CATALYTIC CONVERTERS

The same distinction applies to the catted versions.

SOUL Sport Catalytic Converters

• Catted

• Split-bank architecture

• Deeper, fuller tone

• Approximately 13 lbs

• $3,055

SOUL Catted X-Pipe

• Catted

• X-pipe architecture

• More blended sound character

• 2.5-inch large-diameter tubing

• $3,195

The price difference is relatively small, so customer preference should primarily come down to sound architecture rather than cost.

WITH FACTORY SIDE MUFFLERS

The X-Pipe can be used with the original Porsche rear mufflers.

This provides the most conservative overall system.

Expect the X-Pipe to increase:

• Flat-six presence

• Exhaust flow

• Throttle-related sound

• High-RPM character

while the factory mufflers continue providing substantial downstream sound attenuation.

WITH SOUL SPORT SIDE MUFFLERS

The X-Pipe can also be combined with SOUL Sport Side Mufflers on compatible Carrera applications.

This creates a substantially more comprehensive exhaust system.

Expect:

• Greater overall volume

• More mechanical flat-six sound

• Increased high-RPM intensity

• Reduced exhaust restriction

• Greater cabin presence

The SOUL Side Mufflers retain their proprietary drone-control design, which can be particularly useful when the upstream exhaust has also been made freer flowing.

996 CARRERA 4S

The X-Pipe catalyst section is compatible with the 996 Carrera 4S, even though the standard Carrera Sport Side Mufflers are not.

A Carrera 4S therefore needs:

• The appropriate shared 996 catalyst/X-pipe component

combined with:

• Carrera 4S-specific rear mufflers if upgrading the muffler section

This distinction is important when assembling a complete C4S exhaust package.

T304L STAINLESS CONSTRUCTION

Each system is fabricated from:

.065-inch-wall T304L stainless steel

in:

2.5-inch diameter

T304L provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Long service life

• Consistent exhaust fabrication

• Suitability for repeated street and track heat cycles

SMOOTH MANDREL BENDS

SOUL uses mandrel-bent tubing to maintain the intended internal cross-sectional area through bends.

This helps prevent excessive pipe deformation and supports consistent exhaust flow throughout the assembly.

THICK EXHAUST FLANGES

Heavy-duty flanges are used at the exhaust connections to maintain:

• Proper sealing

• Accurate alignment

• Structural stability

• Durability through repeated thermal cycling

FIXTURE-TESTED FITMENT

Each SOUL X-Pipe is tested in a dedicated fabrication fixture prior to shipment.

This allows SOUL to verify:

• Flange alignment

• Pipe geometry

• Catalyst positioning where applicable

• Downstream exhaust alignment

• Overall dimensional consistency

Completed assemblies are then foam packed to protect them during shipment.

PERFORMANCE

SOUL states that the large 2.5-inch architecture is intended to maximize power gains compared with the restrictive factory system.

However, the current product page does not publish a controlled before-and-after dyno result for either X-Pipe configuration.

DasMotoring therefore does not advertise a specific numerical horsepower or torque increase.

WEIGHT

SOUL's current X-Pipe page does not publish a verified weight for either the Competition or Catted X-Pipe configuration.

Although weight data exists for the standalone Cat Bypass Pipes and Sport Catalytic Converters, those use a different split-bank architecture.

DasMotoring therefore does not apply those weights to the X-Pipe product.

CHECK ENGINE LIGHT — COMPETITION VERSION

The Competition configuration removes the catalytic converters.

Because catalyst functionality is eliminated, catalyst-related diagnostic faults may occur.

An appropriate competition ECU calibration may be necessary for diagnostic management depending on the vehicle.

CATTED CONFIGURATION AND CEL BEHAVIOR

The Catted X-Pipe retains SOUL Sport Catalytic Converters.

SOUL's standalone Sport Catalytic Converters are developed around CEL-free operation, but the current dedicated X-Pipe page does not separately publish a diagnostic guarantee for the XP.SCC configuration.

DasMotoring therefore avoids making an absolute CEL guarantee for the catted X-Pipe.

ECU TUNING

No ECU calibration is required simply for the X-Pipe hardware to physically fit the vehicle.

For the catless Competition configuration, tuning may be appropriate to manage catalyst-related diagnostic faults and optimize a modified engine.

For the Catted configuration, tuning is not specified as a requirement.

EMISSIONS / COMPETITION USE NOTE

The Competition X-Pipe removes the factory catalytic converters and is intended for off-road / closed-course competition applications.

SOUL states that the product is not CARB certified and may not be legal for use on emissions-controlled vehicles.

The Catted configuration retains aftermarket Sport Catalytic Converters but should not be represented as original Porsche emissions equipment.

Customers are responsible for determining compliance with applicable regulations.

Product Description

The SOUL Sport Catalytic Converters are a direct-fit performance upgrade for the 1999–2004 Porsche 996 Carrera, replacing the restrictive factory catalyst assemblies with freer-flowing high-flow catalytic converters designed to increase exhaust flow, improve performance potential, and bring significantly more character out of Porsche's naturally aspirated flat-six.

SOUL took a particularly sound-focused approach to the 996. Rather than connecting the left and right cylinder banks through an X-pipe, SOUL deliberately keeps the exhaust banks separated after testing both configurations back-to-back. SOUL found that an X-pipe reduced some of the deeper frequencies that give the 996 its distinctive sound, while the split-bank configuration produced a deeper, fuller flat-six note with greater volume and a slight rasp reminiscent of earlier air-cooled Porsche exhaust character.

The complete SOUL assemblies weigh approximately 13 lbs compared with 15 lbs for the factory catalyst components, reducing exhaust-system weight by approximately 2 lbs / 0.9 kg.

SOUL also developed the Sport Catalytic Converters around increased flow without catalyst-related check engine lights under normal operation, making them a much more street-oriented alternative to completely catless bypass pipes.

FITMENT:

• Fits 1999–2004 Porsche 996 Carrera

• Fits 1999–2004 Porsche 996 Carrera Cabriolet

• Fits 1999–2004 Porsche 996 Carrera 4

• Fits 1999–2004 Porsche 996 Carrera 4 Cabriolet

• Fits 2002–2004 Porsche 996 Carrera 4S

• Fits 2004 Porsche 996 Carrera 4S Cabriolet

• SOUL specifies fitment for all Porsche 996 Carreras from 1999–2004

• Compatible with 996.1 and 996.2 Carrera applications

• Compatible with the factory rear mufflers

• Compatible with SOUL Sport Side Mufflers

• Compatible with other appropriate 996 Carrera rear exhaust configurations

• Does not apply to 996 Turbo, GT2, or GT3 models

DETAILS:

• Pair of Sport Catalytic Converter assemblies

• Premium high-flow catalytic converters

• Replaces the restrictive factory catalyst assemblies

• Retains a catted exhaust configuration

• Designed to improve exhaust flow

• Designed to increase performance potential

• Increased flat-six exhaust volume

• Deeper, fuller naturally aspirated exhaust tone

• Slightly more aggressive rasp

• Air-cooled-inspired tonal character

• Split-bank exhaust design

• Deliberately avoids an X-pipe in the catalyst section

• SOUL tested split-bank and X-pipe configurations back-to-back

• Developed for catalyst-related CEL-free operation under normal conditions

• Approximately 13 lbs / 5.9 kg

• Factory catalyst assemblies approximately 15 lbs / 6.8 kg

• Saves approximately 2 lbs / 0.9 kg

• Approximately 13% lighter than the factory components being replaced

• Constructed from .065-inch-wall T304L stainless steel

• Smooth mandrel-bent tubing

• Thick exhaust flanges

• New catalyst-to-header mounting hardware included

• Fixture-tested prior to shipment

• Foam-packed after quality inspection

• Designed and manufactured in Willow Grove, Pennsylvania

• 3-year warranty on the catalytic converters

• Lifetime warranty on the stainless-steel pipe assemblies

HIGH-FLOW CATALYTIC CONVERTERS

The factory 996 Carrera catalytic converters are one of the more restrictive components in the original exhaust system.

SOUL replaces the original assemblies with freer-flowing catalytic converters designed to increase exhaust-flow capacity while retaining catalyst functionality.

Benefits include:

• Reduced exhaust restriction

• Greater exhaust sound

• Increased engine character

• Improved performance potential

• Retained catalytic converters

• Reduced diagnostic compromise compared with fully catless pipes

DEVELOPED SPECIFICALLY AROUND 996 SOUND

The development of these Sport Catalytic Converters was not simply a matter of fitting a less restrictive catalyst into the factory location.

SOUL tested different exhaust architectures to determine how the catalyst section affected the distinctive character of the 996 flat-six.

One of the most important findings involved the relationship between the two cylinder banks.

SPLIT-BANK DESIGN

SOUL ultimately chose to keep the left and right exhaust banks separate through the catalyst section.

This was an intentional acoustic decision.

The split-bank configuration helps preserve:

• Deeper exhaust frequencies

• Fuller flat-six tone

• Greater exhaust volume

• Individual cylinder-bank character

• A slightly rawer and more mechanical sound

The result is particularly appropriate for the naturally aspirated 996 Carrera, where exhaust tone and engine character are often as important as outright volume.

WHY SOUL DID NOT USE AN X-PIPE

SOUL also tested an X-pipe arrangement during development.

The company found that connecting the two banks through an X-pipe produced a hollower exhaust note and removed some of the deeper frequencies it preferred on the 996.

SOUL therefore chose the split-bank architecture for the production system.

This is an important distinction from many performance exhaust systems where an X-pipe is automatically assumed to be the desirable solution.

On the 996, SOUL prioritized the sound character produced by keeping the banks separated.

DEEPER, FULLER FLAT-SIX SOUND

SOUL describes the finished sound as deeper and fuller than the factory catalyst configuration.

Expect greater:

• Flat-six mechanical character

• Midrange exhaust presence

• High-RPM intensity

• Throttle-related feedback

• Acceleration volume

• Exhaust texture

The high-flow catalyst configuration also introduces a subtle additional rasp without turning the system into an uncontrolled or excessively harsh catless exhaust.

AIR-COOLED-INSPIRED CHARACTER

One of SOUL's development goals was to bring some of the rawer character associated with earlier Porsche flat-six engines into the water-cooled 996 platform.

The combination of:

• Separate exhaust banks

• Freer-flowing catalysts

• Reduced sound attenuation

produces a tone SOUL characterizes as having a hint of air-cooled-inspired exhaust character.

This does not make a 996 sound identical to an air-cooled 911, but it describes the deeper and more mechanical direction SOUL pursued during development.

WITH FACTORY SIDE MUFFLERS

The Sport Catalytic Converters can be installed while retaining the factory Porsche rear mufflers.

This is the more conservative configuration.

Expect:

• Increased engine sound

• Deeper exhaust tone

• Greater throttle-related character

• Improved exhaust flow

• Retained factory rear mufflers

• Retained OEM exterior appearance

• More restrained overall volume than a complete aftermarket exhaust system

For a street-driven 996, this provides a useful first-stage exhaust upgrade.

WITH SOUL SPORT SIDE MUFFLERS

SOUL specifically developed those mufflers with upgraded high-flow catalysts in mind.

The combination provides:

• High-flow catalytic converters

• Increased naturally aspirated flat-six character

• Greater overall exhaust volume

• Deeper tone

• More aggressive high-RPM sound

• SOUL's proprietary drone-control mufflers

• Better cruising refinement than a muffler-delete configuration

This is the logical more-complete street exhaust setup for a 996 Carrera owner who wants increased sound without going fully catless.

WITH MORE AGGRESSIVE REAR EXHAUST COMPONENTS

Because the Sport Catalytic Converters allow more exhaust energy and sound downstream, the final character will depend heavily on the rear exhaust installed behind them.

A car using:

• Factory mufflers

will remain comparatively restrained.

A car using:

• SOUL Sport Side Mufflers

will become substantially more engaging while retaining acoustic control.

More aggressive muffler-bypass or race-oriented components will further increase:

• Volume

• Rasp

• Cabin presence

• High-RPM intensity

DEVELOPED FOR CEL-FREE OPERATION

SOUL currently markets the Sport Catalytic Converters around providing increased performance and sound without a check engine light.

That is an important distinction from the company's Cat Bypass Pipes.

DasMotoring should treat this as the manufacturer's design intent, not as an unconditional diagnostic guarantee on every 20+ year-old vehicle.

Catalyst-monitoring behavior can still potentially be affected by:

• Aging oxygen sensors

• Existing exhaust leaks

• ECU software

• Engine condition

• Fuel mixture

• Additional exhaust modifications

• Catalyst condition over time

NO ECU TUNE REQUIRED

SOUL does not specify an ECU tune as necessary for installation.

The Sport Catalytic Converters are intended as a bolt-on hardware upgrade.

A performance calibration may provide additional benefit when combined with other engine modifications, but one is not required simply to install these catalyst assemblies.

NO PUBLISHED STANDALONE DYNO NUMBER

SOUL describes the high-flow catalysts as providing increased power, but the current product page does not provide a controlled factory-catalyst versus Sport-Catalyst dyno comparison.

There is no manufacturer-supported numerical horsepower or torque gain appropriate to publish for this product alone.

2-LB WEIGHT REDUCTION

SOUL publishes:

Factory Catalytic Converter Assemblies:
approximately 15 lbs / 6.8 kg

SOUL Sport Catalytic Converters:
approximately 13 lbs / 5.9 kg

Weight Savings:
approximately 2 lbs / 0.9 kg

That represents approximately a:

13% reduction

in the weight of the catalyst components being replaced.

The primary benefits of this product are flow and sound rather than substantial weight reduction, but the 2-lb reduction is still a useful secondary benefit.

.065-INCH T304L STAINLESS CONSTRUCTION

The catalyst assemblies are fabricated from:

.065-inch-wall T304L stainless steel

This provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Long service life

• Consistent exhaust fabrication

• Suitability for repeated street and track heat cycles

SMOOTH MANDREL BENDS

SOUL uses smooth mandrel bends to maintain the internal cross-sectional area of the exhaust tubing through changes in direction.

This helps preserve:

• Exhaust flow

• Internal geometry

• Consistent fitment

• Structural integrity

THICK EXHAUST FLANGES

The Sport Catalytic Converters use substantial exhaust flanges to maintain proper sealing and alignment during repeated heating and cooling cycles.

This is especially important on the 996, where original exhaust hardware may already have experienced decades of heat cycling.

NEW MOUNTING HARDWARE INCLUDED

SOUL supplies new hardware for the:

Catalytic Converter → Header

connections.

This avoids relying solely on aged original mounting hardware during installation.

Additional existing exhaust hardware should still be inspected during installation and replaced where appropriate.

FIXTURE-TESTED FITMENT

Each catalyst assembly is manufactured and inspected using dedicated production fixtures.

SOUL tests the completed components for correct fitment before shipment.

This helps verify:

• Flange alignment

• Pipe geometry

• Catalyst positioning

• Downstream exhaust alignment

• Overall dimensional consistency

The completed components are then foam packed for shipping.

CARRERA 4S COMPATIBILITY

Unlike the Sport Side Mufflers we just cataloged, these Sport Catalytic Converters are not limited to the narrow-body Carrera muffler architecture.

SOUL specifies the catalyst product for all 996 Carreras from 1999–2004, and the same POR.996.SCC hardware is used on Carrera 4S applications.

This means a Carrera 4S owner can use these Sport Catalytic Converters even though they need the separate C4S-specific SOUL Side Mufflers if upgrading the rear muffler section.

SPORT CATALYTIC CONVERTERS VS. CAT BYPASS PIPES

SOUL Sport Catalytic Converters

• $3,055.00

• Retain high-flow catalytic converters

• Split-bank architecture

• Deeper, fuller exhaust tone

• Developed for CEL-free operation

• Approximately 13 lbs

• Saves approximately 2 lbs

• More street-oriented configuration

SOUL Cat Bypass Pipes

• Lower purchase price

• Completely catless

• Maximum catalyst-section flow

• Greater exhaust volume

• More raw exhaust character

• Greater emissions implications

• Catalyst-related CEL potential

• Competition-oriented configuration

The Sport Catalytic Converters are the more appropriate choice for customers wanting increased sound and flow without completely removing the catalyst substrates.

CATALYTIC-CONVERTER WARRANTY

SOUL provides a specific:

3-year warranty

on the catalytic converters themselves.

The stainless-steel pipe assemblies are covered by SOUL's:

Lifetime Warranty

for street and track use.

This distinction is important because the catalyst substrates are wear and emissions-control components with different service characteristics than the fabricated stainless-steel piping.

EMISSIONS NOTE

The SOUL Sport Catalytic Converters retain catalytic converters but replace Porsche's original catalyst assemblies with aftermarket high-flow components.

Their presence should not be interpreted as guaranteeing compliance with every emissions or inspection program.

Customers are responsible for determining whether the product and their complete vehicle configuration comply with applicable regulations and inspection requirements.

Product Description

The SOUL Sport Side Mufflers are a refined performance exhaust upgrade for the 1999–2004 Porsche 996 Carrera, developed to bring out more of the naturally aspirated flat-six sound without introducing the excessive rasp, drone, or cabin resonance that can come with more aggressive 996 exhaust modifications.

SOUL builds the system around proprietary drone-fighting mufflers designed to remain refined during steady-speed cruising while increasing volume and mechanical engine tone under moderate and aggressive throttle. The result is an OEM-plus character suitable for regular street use while still providing a much more engaging exhaust note when the engine is worked.

The Sport Side Mufflers were specifically developed and sound-tested with freer-flowing Sport Catalytic Converters, allowing the system to remain controlled even when paired with additional upstream exhaust modifications.

Each system uses 2.25-inch mandrel-bent, .065-inch-wall T304L stainless-steel tubing, bespoke SOUL mufflers, laser-cut brackets, and back-purged TIG welding.

At approximately 29.7 lbs, the SOUL Sport Side Mufflers save approximately 5.1 lbs / 2.3 kg compared with the approximately 34.8-lb factory components.

FITMENT:

• Fits 1999–2004 Porsche 996 Carrera

• Fits 1999–2004 Porsche 996 Carrera 4

• Fits Coupe applications

• Fits Cabriolet applications

• Fits Targa applications where applicable

• Available in separate 996.1 and 996.2 configurations

• SOUL's current selector identifies:

  • 996.1: 1998–2001

  • 996.2: 2001–2004

• WILL NOT FIT Porsche 996 Carrera 4S

• Does not fit 996 Turbo / Turbo S

• Does not fit 996 GT3 / GT2

DETAILS:

• Pair of Sport Side Mufflers

• Proprietary SOUL drone-fighting muffler design

• Designed for an aggressive but refined OEM-plus exhaust character

• Increased naturally aspirated flat-six sound

• Increased mechanical engine tone under throttle

• Refined cabin presence during cruising

• Developed to avoid undesirable rasp

• Developed to minimize exhaust drone

• Designed to work well with upgraded high-flow catalytic converters

• 2.25-inch diameter tubing

• .065-inch wall thickness

• T304L stainless-steel construction

• Smooth mandrel bends

• Bespoke SOUL mufflers

• Laser-cut mounting brackets

• Back-purged TIG welding

• ARCAL Prime argon shielding gas used during fabrication

• Built in thick-gauge aluminum fixtures to control distortion

• Fixture-tested before shipment

• New high-grade bolts, washers, and nuts included

• Approximately 29.7 lbs / 13.5 kg

• Factory components approximately 34.8 lbs / 15.8 kg

• Saves approximately 5.1 lbs / 2.3 kg

• Approximately 15% lighter than the corresponding factory components

• Available with Polished Chrome X-50 Style tips

• Available with Black Chrome X-50 Style tips

• Designed and built in Willow Grove, Pennsylvania

• Backed by SOUL Performance Products' Lifetime Warranty for street and track use

DESIGNED FOR THE NATURALLY ASPIRATED 996 CARRERA

The 996 Carrera's naturally aspirated flat-six responds dramatically to exhaust changes, but increasing volume alone does not necessarily produce a better result.

An overly aggressive muffler can introduce:

• Low-frequency cabin drone

• Harshness during cruising

• Excessive rasp

• Unpleasant resonance

• Fatiguing highway sound

SOUL developed the Sport Side Mufflers around increasing the desirable engine frequencies while retaining enough acoustic control for regular road use.

PROPRIETARY DRONE-FIGHTING MUFFLERS

The centerpiece of the system is SOUL's proprietary muffler design.

Rather than simply reducing muffler volume or using straight-through bypass pipes, SOUL maintains substantial sound-attenuating material within the side mufflers.

The objective is to produce two different personalities depending on how the car is driven.

During steady-speed cruising:

• Controlled cabin presence

• Reduced resonance

• OEM-plus refinement

• Comfortable highway behavior

Under moderate to aggressive throttle:

• Increased flat-six sound

• Greater mechanical engine character

• Stronger acceleration note

• More engaging high-RPM sound

OEM-PLUS STREET CHARACTER

SOUL describes this system as its more refined approach to the 996 Carrera.

The goal is not maximum volume.

Instead, the Sport Side Mufflers prioritize a balance between:

Sound

Tone

Refinement

Daily usability

That makes the system particularly appropriate for owners who regularly drive their 996 on the street and want a clear improvement in sound without turning the car into an excessively loud or resonant exhaust build.

DEVELOPED WITH SPORT CATALYTIC CONVERTERS

SOUL specifically developed these mufflers while testing them with its Sport Catalytic Converters.

That matters because reducing catalyst restriction increases both exhaust volume and higher-frequency content before the gases ever reach the rear mufflers.

The Sport Side Mufflers therefore contain enough sound attenuation to remain controlled even when paired with freer-flowing catalyst sections.

This makes them a useful foundation for either:

• An otherwise-stock 996 Carrera

or

• A more complete SOUL exhaust configuration

SOUND WITH FACTORY CATALYTIC CONVERTERS

With the original Porsche catalytic converters retained, the Sport Side Mufflers provide the more conservative configuration.

Expect:

• Increased exhaust volume

• Richer flat-six tone

• More audible mechanical character

• Stronger acceleration sound

• Increased high-RPM presence

• Refined cruising behavior

This is the logical configuration for an owner primarily looking for a better exhaust note without substantially changing the rest of the exhaust system.

SOUND WITH SOUL SPORT CATALYTIC CONVERTERS

Pairing the Sport Side Mufflers with SOUL Sport Catalytic Converters produces a more comprehensive sound and flow upgrade.

Compared with the mufflers alone, expect:

• Greater exhaust volume

• More engine character

• Increased high-RPM presence

• More direct throttle-related sound

• Reduced catalyst restriction

• Greater overall exhaust intensity

The Sport Side Mufflers were specifically developed with this type of configuration in mind.

SOUND WITH CAT BYPASS PIPES

Pairing the mufflers with catless bypass pipes creates a considerably more aggressive exhaust system.

Expect:

• Much greater overall volume

• More raw exhaust character

• More high-frequency content

• Increased deceleration sound

• Greater cabin presence

The Sport Side Mufflers still provide substantially more acoustic control than a muffler-delete system, but upstream catalyst removal changes the character considerably.

AVOIDING THE "RASPY 996" PROBLEM

SOUL specifically calls out how easy it is to make the 996 louder while simultaneously making it sound less refined.

The Sport Side Mufflers were developed to preserve the deeper and more desirable frequencies of the Porsche flat-six rather than simply amplifying everything.

SOUL's objective was to avoid:

• Thin exhaust tone

• Metallic rasp

• Excessive high-frequency harshness

• Persistent cabin resonance

while maintaining a noticeable increase in performance-oriented sound.

2.25-INCH TUBING

The system uses:

2.25-inch-diameter tubing

constructed from T304L stainless steel.

This diameter is sized around the naturally aspirated 996 Carrera application rather than simply using unnecessarily oversized piping.

Maintaining an appropriately sized exhaust path helps preserve:

• Exhaust velocity

• Sound quality

• Packaging

• Fitment

• Street drivability

.065-INCH-WALL T304L STAINLESS STEEL

SOUL constructs the muffler assemblies from:

.065-inch-wall T304L stainless steel

This provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Reasonable component weight

• Long service life

• Suitability for street and track heat cycling

MANDREL-BENT TUBING

The tubing is mandrel bent to preserve internal cross-sectional area through bends.

This prevents the pipe from becoming excessively crushed or narrowed through changes in direction and helps maintain consistent exhaust flow.

BACK-PURGED TIG WELDING

SOUL uses back-purged TIG welding during fabrication.

SOUL specifically identifies ARCAL Prime argon as its shielding gas for this process.

Back purging protects the inside of the stainless tubing while welding and helps provide:

• Cleaner internal weld surfaces

• Proper weld penetration

• Reduced internal oxidation

• Greater long-term durability

LASER-CUT BRACKETS

The Sport Side Mufflers incorporate precision laser-cut mounting brackets.

Consistent bracket geometry is important on the compact rear packaging of the 996 because it helps maintain:

• Muffler positioning

• Tip alignment

• Chassis clearance

• Exhaust mounting geometry

THICK-GAUGE ALUMINUM FABRICATION FIXTURES

Each exhaust is assembled and tested in a thick-gauge aluminum fixture.

The fixture helps prevent heat-induced warping during fabrication and provides repeatable:

• Muffler location

• Pipe alignment

• Bracket positioning

• Exhaust-tip positioning

FIXTURE-TESTED FITMENT

Every completed system is checked before shipment.

SOUL fixture-tests the exhaust to verify fitment and performs an in-house quality-control inspection before foam packing the components for transportation.

5.1-LB WEIGHT REDUCTION

SOUL publishes the following figures:

Factory Exhaust Components:
approximately 34.8 lbs / 15.8 kg

SOUL Sport Side Mufflers:
approximately 29.7 lbs / 13.5 kg

Weight Savings:
approximately 5.1 lbs / 2.3 kg

That represents roughly a:

15% reduction

in the weight of the components being replaced.

The primary purpose of these mufflers is sound quality rather than extreme weight reduction, but the reduced rear mass is a useful secondary benefit.

X-50 STYLE EXHAUST TIPS

SOUL supplies these mufflers with X-50 Style exhaust tips.

Two finishes are currently available:

Polished Chrome X-50 Style

and

Black Chrome X-50 Style

The X-50-inspired outlets provide a more sporting appearance than the standard Carrera exhaust finish while remaining appropriate for the period styling of the 996.

POLISHED CHROME X-50 STYLE TIPS

The Polished Chrome configuration provides the traditional bright-metal appearance.

Price: $3,175.00

BLACK CHROME X-50 STYLE TIPS

The Black Chrome version provides a darker and more understated appearance.

Price: $3,415.00

996.1 VS. 996.2

SOUL currently requires the customer to select the correct 996 generation when ordering.

The manufacturer currently identifies the options as:

996.1 — 1998–2001

996.2 — 2001–2004

For the DasMotoring U.S.-market 996 category, this generally corresponds to the early and facelift Carrera configurations.

Because SOUL lists 2001 in both selections, customers with a 2001 model should confirm whether their vehicle requires the 996.1 or 996.2 configuration before ordering if there is any uncertainty.

IMPORTANT: DOES NOT FIT CARRERA 4S

SOUL explicitly states:

WILL NOT FIT C4S

The wide-body 996 Carrera 4S uses different rear exhaust packaging and requires its own dedicated SOUL product.

Do not order this standard 996 Carrera Sport Side Muffler system for a Carrera 4S.

NO PUBLISHED HORSEPOWER CLAIM

SOUL's current product page focuses on:

• Exhaust tone

• Drone management

• Construction

• Weight

• Fitment

It does not provide a controlled before-and-after horsepower or torque result for the Sport Side Mufflers alone.

DasMotoring therefore does not advertise a numerical power increase from this product.

NO ECU TUNE REQUIRED

The Sport Side Mufflers replace rear exhaust components only.

No ECU calibration is required simply to install the mufflers.

They do not themselves replace:

• Catalytic converters

• Oxygen sensors

• Headers

• Engine-management components

DIRECT BOLT-ON INSTALLATION

SOUL includes new:

• High-grade bolts

• Washers

• Nuts

with the system.

The mufflers are designed as direct-fit replacement components and do not require cutting or welding during normal installation.