Porsche 991.1 / 991.2 Turbo / Turbo S SOUL Cat Bypass Pipes

Product Description

The SOUL Cat Bypass Pipes are a direct bolt-on performance upgrade for the 2013–2019 Porsche 991.1 and 991.2 911 Turbo / Turbo S, replacing the restrictive factory catalytic converters with free-flowing 3-inch stainless-steel straight pipes.

Located immediately downstream of the turbochargers, the factory catalytic converters restrict exhaust flow while also suppressing a substantial amount of turbocharger and engine sound. SOUL removes the catalyst assemblies entirely and replaces them with large-diameter, mandrel-bent piping designed to maximize post-turbo exhaust flow.

The result is a dramatic increase in audible turbocharger spool, stronger flat-six exhaust character, increased crackles during deceleration, and improved throttle response.

At approximately 6 lbs, the SOUL Cat Bypass Pipes are approximately 10 lbs / 4.5 kg lighter than the roughly 16-lb factory catalytic-converter assemblies they replace.

FITMENT:

• Fits 2013–2016 Porsche 991.1 911 Turbo

• Fits 2013–2016 Porsche 991.1 911 Turbo S

• Fits 2017–2019 Porsche 991.2 911 Turbo

• Fits 2017–2019 Porsche 991.2 911 Turbo S

• Fits 2018 Porsche 991.2 911 Turbo S Exclusive Series

• Fits Coupe and Cabriolet applications where offered

• SOUL specifies fitment for all 991.1 and 991.2 Turbo vehicles

• Compatible with the factory rear exhaust

• Compatible with SOUL X-Pipe Exhaust

• Compatible with SOUL Valved Exhaust System

• Compatible with applicable SOUL 991 Turbo exhaust packages

DETAILS:

• Pair of catless Cat Bypass Pipes

• Completely removes the factory catalytic converters

• 3-inch diameter piping

• Designed to maximize post-turbo exhaust flow

• Significantly increases turbocharger spool and turbine sound

• Increases flat-six engine and exhaust character

• Improves throttle response

• Increases audible exhaust crackles during deceleration

• Approximately 6 lbs / 2.7 kg

• Factory catalyst assemblies approximately 16 lbs / 7.3 kg

• Saves approximately 10 lbs / 4.5 kg

• Approximately 62.5% lighter than the factory components being replaced

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

• Smooth mandrel-bent tubing

• Thick waterjet-cut flanges

• Direct bolt-on installation

• Hardware included

• Detailed installation instructions included

• Fixture-tested prior to shipment

• May trigger a catalyst-related check engine light

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

• 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 replace the original Porsche catalytic-converter assemblies.

The factory catalysts sit immediately downstream of the turbochargers and create resistance to the exhaust gases leaving the turbine outlets.

SOUL replaces those assemblies with unrestricted straight-through piping, eliminating the catalyst substrate entirely.

This provides:

• Reduced post-turbo restriction

• Greater exhaust-flow capacity

• Increased turbocharger sound

• Stronger engine note

• Improved throttle response

• Reduced exhaust-system weight

• Greater performance potential for modified vehicles

3-INCH EXHAUST PATH

SOUL selected:

3-inch-diameter piping

specifically to maximize exhaust flow and turbocharger sound.

The large-diameter architecture provides additional capacity for vehicles with:

• Factory turbochargers

• ECU tuning

• Increased boost

• Intake upgrades

• Intercooler upgrades

• Turbocharger upgrades

• Freer-flowing rear exhaust systems

• Other supporting performance modifications

For a high-output turbocharged engine, reducing restriction immediately after the turbines becomes increasingly valuable as exhaust mass flow increases.

REDUCED POST-TURBO RESTRICTION

A turbocharger's turbine must discharge exhaust into everything positioned downstream of it.

Restriction after the turbine increases the pressure into which the turbocharger must exhaust.

The factory catalyst substrates are one of the largest restrictions in this section of the 991 Turbo exhaust system.

Removing them provides a substantially more open path for exhaust gases leaving the turbochargers.

The Cat Bypass Pipes are therefore designed to improve the exhaust system's ability to support:

• Increased airflow

• Increased boost

• Higher engine output

• Modified turbocharger configurations

SIGNIFICANTLY MORE TURBO SOUND

Sound is one of the largest changes produced by the Cat Bypass Pipes.

The factory catalysts attenuate much of the sound generated by the Turbo's turbines before it reaches the rear exhaust.

Removing the catalyst substrates allows dramatically more:

• Turbo spool

• Turbo whistle

• Turbine sound

• Boost-related acoustic feedback

• Mechanical turbocharger character

to pass downstream.

SOUL specifically developed the 3-inch design around making the turbochargers considerably more audible.

INCREASED ENGINE NOTE

Removing the catalytic converters also allows significantly more of the 3.8L twin-turbo flat-six exhaust character to pass through the system.

Expect:

• Greater exhaust presence

• More aggressive acceleration sound

• Increased high-RPM intensity

• Stronger throttle-related feedback

• More audible shift events

• Greater deceleration character

The total sound level will depend heavily on which rear exhaust is installed behind the Cat Bypass Pipes.

DECELERATION CRACKLES

SOUL specifically highlights the increase in exhaust crackles during deceleration after removing the factory catalysts.

The freer exhaust path allows more of the engine calibration's existing overrun behavior to be heard.

The amount of crackling will vary with:

• ECU calibration

• 991.1 vs. 991.2 software

• Driving mode

• Rear exhaust configuration

• Other engine modifications

The Cat Bypass Pipes do not themselves create artificial combustion events; they make existing exhaust events considerably more audible.

IMPROVED THROTTLE RESPONSE

SOUL specifically identifies improved throttle response as one of the benefits of removing the restrictive factory catalysts.

Reducing exhaust restriction directly downstream of the turbochargers allows the exhaust system to respond more freely to changing engine load.

This characteristic becomes particularly relevant on tuned vehicles operating at greater airflow and boost levels.

WITH THE FACTORY REAR EXHAUST

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

This configuration provides:

• Significantly increased turbocharger sound

• Reduced post-turbo restriction

• Improved throttle response

• Approximately 10 lbs of weight savings

• Retained factory rear exhaust

• Retained factory exhaust-tip appearance

Keeping the factory rear exhaust provides the most restrained overall sound configuration available with these catless pipes.

WITH THE SOUL X-PIPE EXHAUST

Pairing the Cat Bypass Pipes with SOUL's rear X-Pipe creates a substantially more aggressive exhaust system.

The combination provides:

• Catless 3-inch catalyst sections

• 3-inch rear X-pipe architecture

• Proprietary X-pipe mixing chamber

• Quad straight-through race resonators

• Increased turbocharger sound

• Increased flat-six exhaust volume

• Significant rear exhaust-system weight reduction

This component combination corresponds closely to SOUL's complete Competition X-Pipe Exhaust System architecture.

WITH THE SOUL VALVED EXHAUST

The Cat Bypass Pipes can also be combined with SOUL's Valved Exhaust System.

This creates an especially useful configuration for customers who want the flow and sound benefits of a catless exhaust but still want active volume control.

The combination provides:

• Catless catalyst sections

• Reduced post-turbo restriction

• Aggressive valves-open operation

• Quieter resonated valves-closed operation

• Increased turbocharger sound

• Remote valve control

• HomeLink integration capability

This is a considerably more flexible arrangement than combining the Cat Bypass Pipes with a permanently open rear exhaust.

CAT BYPASS PIPES VS. SPORT CATALYTIC CONVERTERS

SOUL Cat Bypass Pipes

• $1,295.00

• Completely catless

• 3-inch straight-through piping

• Approximately 6 lbs

• Saves approximately 10 lbs

• Maximum catalyst-section flow

• Maximum turbocharger sound

• May trigger catalyst-related CELs

• Competition / off-road focused

SOUL Sport Catalytic Converters

• $3,695.00

• Retain high-flow catalysts

• Approximately 11.6 lbs

• Saves approximately 4.4 lbs

• Increased turbocharger sound

• Improved throttle response

• Developed for catalyst-related CEL-free operation

• More conservative catted configuration

The Cat Bypass Pipes are the more aggressive solution for customers prioritizing flow, sound, weight reduction, and competition use.

10-LB WEIGHT REDUCTION

SOUL publishes the following weights:

Factory Catalytic Converter Assemblies:
Approximately 16 lbs / 7.3 kg

SOUL Cat Bypass Pipes:
Approximately 6 lbs / 2.7 kg

Weight Savings:
Approximately 10 lbs / 4.5 kg

That removes approximately:

62.5%

of the weight of the factory catalyst assemblies.

Because this mass is positioned toward the rear of the 911, the reduction is particularly desirable for track-oriented vehicles.

.065-INCH T304L STAINLESS CONSTRUCTION

Each Cat Bypass Pipe is manufactured from:

.065-inch-wall T304L stainless steel

This material provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Long service life

• Consistent fabrication characteristics

• Suitability for repeated street and track heat cycling

SMOOTH MANDREL BENDS

SOUL uses smooth mandrel bends to preserve the internal diameter of the tubing as it follows the required exhaust routing.

Maintaining a consistent internal cross-section helps avoid unnecessary restrictions in the post-turbo exhaust path.

THICK WATERJET-CUT FLANGES

The Cat Bypass Pipes use thick waterjet-cut flanges.

These are designed to maintain:

• Proper sealing

• Exhaust alignment

• Dimensional stability

• Durability through repeated thermal cycling

FIXTURE-TESTED FITMENT

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

This helps verify:

• Flange location

• Pipe geometry

• Downstream exhaust alignment

• Overall dimensional consistency

Following quality control, SOUL foam packs the components to help protect them during shipment.

DIRECT BOLT-ON INSTALLATION

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

SOUL includes:

• Left Cat Bypass Pipe

• Right Cat Bypass Pipe

• Required installation hardware

• Detailed installation instructions

No cutting or welding is required during normal installation.

SOUL describes the installation as suitable for experienced DIY enthusiasts with appropriate tools and mechanical ability.

CHECK ENGINE LIGHT

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

SOUL explicitly states that this product:

may trigger a check engine light.

DasMotoring therefore does not advertise these pipes as CEL-free.

ECU TUNING

A custom ECU tune is not required for the Cat Bypass Pipes to physically install.

However, SOUL recommends an appropriate custom ECU calibration to address catalyst-related check engine lights on vehicles used for track or competition purposes.

A suitable performance calibration may also take greater advantage of:

• Reduced post-turbo restriction

• Increased exhaust-flow capacity

• Higher boost targets

• Supporting airflow modifications

• Turbocharger upgrades

NO PUBLISHED STANDALONE DYNO FIGURE

SOUL identifies improved throttle response and increased performance potential as benefits of removing the factory catalytic converters.

However, the current Cat Bypass Pipe product page does not provide a controlled factory-catalyst versus Cat-Bypass dyno comparison.

DasMotoring therefore does not advertise a specific horsepower or torque increase from the Cat Bypass Pipes alone.

MODULAR 991 TURBO EXHAUST SYSTEM

The Cat Bypass Pipes work within SOUL's modular 991 Turbo exhaust ecosystem.

They can be combined with:

• Factory rear exhaust

• SOUL X-Pipe Exhaust

• SOUL Valved Exhaust

This allows an owner to upgrade the catalyst and rear exhaust sections independently.

For example:

Cat Bypass + Factory Rear Exhaust

provides increased turbo sound and reduced restriction while retaining the factory rear muffler.

Cat Bypass + SOUL X-Pipe

creates a much more aggressive fixed-volume competition exhaust.

Cat Bypass + SOUL Valved Exhaust

adds active sound control to the catless configuration.

EMISSIONS / COMPETITION USE NOTE

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

SOUL states that this product is:

• Not CARB certified

• May not be legal 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 federal, state, and local regulations.