Porsche 991.2 Carrera Base / S Without PSE SOUL Cat Bypass Pipes

Product Description

The SOUL Cat Bypass Pipes are a direct bolt-on performance upgrade for 2017–2019 Porsche 991.2 Carrera models without Porsche Sport Exhaust / PSE, replacing the restrictive factory catalytic converters with free-flowing 3-inch stainless-steel bypass pipes.

Located immediately downstream of the turbochargers, the factory catalytic converters create substantial post-turbine restriction while also attenuating much of the turbocharger and exhaust sound produced by Porsche's 3.0L twin-turbo flat-six.

SOUL eliminates the catalyst assemblies entirely and replaces them with smooth, mandrel-bent straight-through piping designed to maximize exhaust flow. The result is substantially increased turbocharger sound, a more aggressive exhaust note, sharper throttle response, and additional performance potential—especially when paired with an appropriate ECU calibration.

The Cat Bypass Pipes retain Porsche's factory turbocharger heat shields, maintaining the OEM thermal-protection strategy around the turbos and surrounding engine-bay components.

FITMENT:

• Fits 2017–2019 Porsche 991.2 911 Carrera Coupe without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera Cabriolet without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4 Coupe without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4 Cabriolet without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera S Coupe without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera S Cabriolet without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4S Coupe without PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4S Cabriolet without PSE

• Fits 2017–2019 Porsche 991.2 911 Targa 4 without PSE

• Fits 2017–2019 Porsche 991.2 911 Targa 4S without PSE

• Designed specifically for vehicles without factory Porsche Sport Exhaust / PSE

• Compatible with manual and PDK transmissions where applicable

• Compatible with the factory rear exhaust

• Compatible with SOUL Performance Exhaust Systems for non-PSE cars

• Compatible with SOUL Sport Headers

DETAILS:

• Pair of catless Cat Bypass Pipes

• Replaces both factory catalytic-converter assemblies

• Designed specifically for non-PSE 991.2 Carrera applications

• 3-inch diameter piping

• Straight-through exhaust architecture

• Designed to maximize post-turbo exhaust flow

• Reduces restriction immediately downstream of the turbochargers

• Increases turbocharger spool and whistle sound

• Increases exhaust volume

• Improves throttle response

• Increases performance potential

• Particularly beneficial when paired with ECU tuning

• Retains factory turbocharger heat shields

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

• Smooth mandrel bends

• Thick exhaust flanges

• Fixture-tested prior to shipment

• Direct bolt-on installation

• Detailed installation instructions included

• May trigger a catalyst-efficiency check engine light

• Custom ECU calibration recommended for catalyst-related CEL management on closed-course vehicles

• No product variants

• Designed and manufactured in-house by SOUL Performance Products

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

COMPLETE CATALYTIC-CONVERTER DELETE

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

The factory exhaust arrangement places the catalysts immediately downstream of the turbochargers.

SOUL replaces those catalyst assemblies with smooth straight-through piping, eliminating the restriction created by the catalyst substrates.

This provides:

• Greater post-turbo exhaust-flow capacity

• Reduced exhaust restriction

• Increased turbocharger sound

• Greater exhaust volume

• Improved throttle response

• Increased tuning potential

3-INCH EXHAUST PATH

SOUL selected:

3-inch diameter piping

to maximize available exhaust flow from the turbochargers.

The large-diameter design is particularly appropriate for modified vehicles where increased boost and airflow create greater exhaust mass flow.

The 3-inch architecture provides additional capacity for combinations involving:

• ECU tuning

• SOUL Sport Headers

• SOUL Performance Exhaust

• Higher boost targets

• Other supporting performance modifications

REDUCED POST-TURBO RESTRICTION

On a turbocharged engine, exhaust restriction after the turbine creates pressure that the turbocharger must work against.

Reducing post-turbine restriction can improve the efficiency with which exhaust gases leave the turbocharger.

The factory catalytic converters are one of the largest restrictions in this section of the 991.2 Carrera exhaust.

Removing them can therefore improve:

• Turbo response

• Throttle response

• Exhaust-flow capacity

• Midrange response

• Power potential

The benefit can become increasingly significant as engine output and boost pressure increase.

INCREASED TURBOCHARGER SOUND

One of the most noticeable changes after removing the factory catalysts is the increase in audible turbocharger activity.

Expect significantly more:

• Turbo spool

• Turbo whistle

• Turbine sound

• Throttle-related acoustic feedback

• Exhaust texture

The factory catalysts suppress a substantial amount of this sound before it ever reaches the rear exhaust.

Removing them makes the turbocharged nature of the 991.2 Carrera considerably more obvious.

EXHAUST SOUND

The Cat Bypass Pipes also increase the overall presence of the engine and exhaust system.

Expect:

• Louder cold starts

• Increased exhaust volume

• Greater engine character under acceleration

• Stronger turbocharger sound

• Increased high-RPM presence

• More audible shifts

• Greater deceleration character

The amount of pops and crackles will depend heavily on the vehicle's ECU calibration.

Unlike PSE-equipped cars, a non-PSE Carrera should not automatically be expected to produce the same factory-programmed pops and bangs simply because the catalytic converters have been removed.

NON-PSE EXHAUST ARCHITECTURE

These Cat Bypass Pipes are specifically designed for the standard non-PSE exhaust system.

That is important because the PSE and non-PSE versions of the 991.2 Carrera use different downstream exhaust arrangements.

SOUL therefore offers separate:

PSE Cat Bypass Pipes

and

Non-PSE Cat Bypass Pipes

with different manufacturer part numbers.

The non-PSE version should not be substituted with the PSE-specific product.

RETAINS THE FACTORY REAR EXHAUST

The Cat Bypass Pipes can be installed while retaining the original non-PSE rear exhaust.

This configuration provides:

• Increased turbocharger sound

• Increased engine character

• Reduced post-turbo restriction

• Retained factory rear muffler

• Retained OEM exterior appearance

Because the standard rear muffler remains installed, this is considerably more restrained than combining the Cat Bypass Pipes with a freer-flowing aftermarket rear exhaust.

WITH SOUL PERFORMANCE EXHAUST

Pairing the Cat Bypass Pipes with SOUL's non-PSE Performance Exhaust creates a much more aggressive overall system.

This combination provides:

• Catless 3-inch post-turbo piping

• Reduced catalyst restriction

• Increased turbo sound

• Increased rear exhaust volume

• Greater throttle response

• More aggressive flat-six character

• Optional Helmholtz anti-drone technology in the Performance Exhaust

Customers seeking a street-driven configuration should carefully consider SOUL's Anti-Drone Performance Exhaust when combining it with these Cat Bypass Pipes.

WITH SOUL SPORT HEADERS

The Cat Bypass Pipes can also be paired with SOUL Sport Headers.

The two products address different sections of the exhaust system:

Sport Headers

Improve exhaust flow before the turbochargers.

Cat Bypass Pipes

Reduce exhaust restriction after the turbochargers.

Together, they provide freer exhaust flow on both sides of the turbocharger assemblies.

WITH ECU TUNING

SOUL specifically notes that substantial additional performance potential is available when the Cat Bypass Pipes are paired with ECU tuning.

A performance calibration can take greater advantage of:

• Reduced post-turbo restriction

• Increased exhaust-flow capacity

• Higher boost targets

• Improved turbocharger response

• Additional supporting modifications

A tune is not required for the pipes to physically fit the vehicle.

However, an ECU calibration may be required to address catalyst-related diagnostic faults after the factory catalysts are removed.

CHECK ENGINE LIGHT

Because the Cat Bypass Pipes completely remove the factory catalytic converters, the vehicle's catalyst-monitoring system may detect that the original emissions equipment is no longer present.

SOUL explicitly states that this product:

may trigger a check engine light.

A custom ECU calibration may be used to address catalyst-related diagnostic faults on vehicles used for closed-course competition.

DasMotoring does not advertise the Cat Bypass Pipes as a guaranteed CEL-free product.

NO PUBLISHED STANDALONE DYNO FIGURE

SOUL states that performance gains are available from the freer-flowing Cat Bypass Pipes and notes that additional gains can be achieved with ECU calibration.

However, the current manufacturer page for the non-PSE version does not publish a controlled standalone horsepower or torque figure.

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

NO PUBLISHED WEIGHT FIGURE

The Cat Bypass Pipes eliminate the heavy factory catalytic-converter assemblies and therefore reduce exhaust-system weight.

However, SOUL's current non-PSE product page does not publish verified factory and SOUL component weights.

DasMotoring therefore does not advertise a numerical weight-savings figure for this particular non-PSE product.

RETAINS FACTORY TURBO HEAT SHIELDS

SOUL intentionally designed the Cat Bypass Pipes to retain the original Porsche turbocharger heat shields.

This helps maintain the factory thermal-management strategy around:

• Turbochargers

• Engine-bay wiring

• Hoses

• Plastic components

• Other heat-sensitive hardware

Removing the catalytic converters does not eliminate the extreme temperatures generated immediately downstream of the turbochargers, making proper heat management important.

.065-INCH T304L STAINLESS CONSTRUCTION

Each Cat Bypass Pipe is constructed from:

.065-inch-wall T304L stainless steel

T304L provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Long service life

• Suitable properties for repeated street and track heat cycling

SMOOTH MANDREL BENDS

SOUL uses smooth mandrel-bent tubing to maintain a consistent internal flow area through each bend.

This helps avoid the reduced internal diameter that can occur when conventional tubing is bent without proper support.

The result is a smoother path for exhaust gases leaving the turbochargers.

THICK EXHAUST FLANGES

The system incorporates substantial flanges designed to maintain proper sealing and alignment in a high-temperature environment.

Each assembly is manufactured around dedicated fixtures so that turbocharger and downstream exhaust connections remain properly positioned.

FIXTURE-TESTED FITMENT

Every set is tested in a fabrication fixture prior to shipment.

This quality-control step helps verify:

• Pipe alignment

• Flange position

• Downstream exhaust alignment

• Overall dimensional consistency

After inspection, SOUL foam packs the components for shipment.

DIRECT BOLT-ON INSTALLATION

The Cat Bypass Pipes directly replace the original catalytic-converter assemblies.

No permanent chassis modification is required.

SOUL includes detailed installation instructions and describes the job as suitable for experienced DIY enthusiasts with the appropriate tools and mechanical experience.

CAT BYPASS VS. SPORT CATALYTIC CONVERTERS

SOUL Cat Bypass Pipes

• $1,975.00

• Completely catless

• 3-inch piping

• Maximum available catalyst-section flow

• Maximum turbocharger sound

• Lower purchase price

• May trigger a catalyst-related CEL

• Intended for competition / off-road use

SOUL Sport Catalytic Converters

• Retain high-flow catalytic converters

• More street-oriented configuration

• Increased turbocharger sound and throttle response

• Designed to avoid the compromises associated with fully catless pipes

• Higher purchase price

The Cat Bypass Pipes are the more aggressive choice for a closed-course vehicle where maximum flow is the priority.

PSE VS. NON-PSE CAT BYPASS PIPES

SOUL offers separate Cat Bypass Pipe systems for the two 991.2 exhaust configurations.

Without PSE

• SOUL PN: POR.9912.CBP

• $1,975.00

• Designed around the standard non-PSE exhaust architecture

With PSE

• Separate PSE-specific product

• Different downstream architecture

• Different SOUL part number

These should remain separate products within the DasMotoring catalog.

EMISSIONS / COMPETITION USE NOTE

The SOUL Cat Bypass Pipes completely remove the factory catalytic converters.

This product is not CARB certified and SOUL specifies it for off-road / competition use only.

Use on an emissions-controlled vehicle operated on public roads may violate applicable federal, state, or local laws.

Customers are responsible for determining the legality of their complete vehicle configuration and intended use.