Porsche 991.2 Carrera with 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 equipped with Porsche Sport Exhaust / PSE, replacing the restrictive factory catalytic converters with large-diameter 3-inch straight-through stainless-steel pipes.

Positioned immediately downstream of the turbochargers, the factory catalytic converters create a significant restriction in the 991.2 Carrera exhaust system. Removing them reduces post-turbine backpressure, increases exhaust-flow capacity, sharpens throttle response, and dramatically increases turbocharger and exhaust sound.

SOUL engineered the Cat Bypass Pipes specifically around the factory PSE architecture. With the exhaust valves open, gases receive a straight-through 3-inch path designed for maximum flow. SOUL also carefully positions the secondary connection to the factory Porsche Sport Exhaust so the car remains significantly more subdued with the valves closed.

Independent Dynojet testing by AWE Tuning on an otherwise stock 2017 Carrera 4S recorded maximum gains of approximately 20 wheel horsepower and 21 lb-ft of torque at 5,800 RPM, with peak-output gains of approximately 10 whp and 14 lb-ft.

The SOUL assemblies weigh only approximately 7.9 lbs, compared with approximately 16 lbs for the corresponding factory catalytic-converter components, saving approximately 8.1 lbs / 3.7 kg.

FITMENT:

• Fits 2017–2019 Porsche 991.2 911 Carrera with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera Cabriolet with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera S with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera S Cabriolet with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4 with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4 Cabriolet with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4S with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera 4S Cabriolet with PSE

• Fits 2017–2019 Porsche 991.2 911 Targa 4 with PSE

• Fits 2017–2019 Porsche 991.2 911 Targa 4S with PSE

• Fits 2018–2019 Porsche 991.2 911 Carrera T with PSE

• Fits 2017–2019 Porsche 991.2 911 Carrera GTS

• Fits 2017–2019 Porsche 991.2 911 Carrera GTS Cabriolet

• Fits 2017–2019 Porsche 991.2 911 Carrera 4 GTS

• Fits 2017–2019 Porsche 991.2 911 Carrera 4 GTS Cabriolet

• Fits 2017–2019 Porsche 991.2 911 Targa 4 GTS

• Factory Porsche Sport Exhaust / PSE required

• Compatible with manual and PDK transmissions where applicable

• Compatible with the factory PSE rear exhaust

• Compatible with SOUL Valved Exhaust System

• Compatible with SOUL X-Pipe Exhaust

• Compatible with factory exhaust headers

• Compatible with applicable SOUL Sport Headers

DETAILS:

• Pair of catless Cat Bypass Pipes

• Completely replaces the factory catalytic-converter assemblies

• Designed specifically for Porsche 991.2 Carrera models with PSE

• Large-diameter 3-inch piping

• Straight-through valves-open exhaust path

• Designed for maximum exhaust flow

• Reduces post-turbo exhaust restriction

• Increases turbocharger sound

• Increases exhaust volume

• Increases crackles and pops during deceleration where generated by the factory calibration

• Improves throttle response

• Hardware-only manufacturer testing showed maximum gains of approximately +20 whp / +21 lb-ft

• Approximately +10 whp / +14 lb-ft at peak output

• Tested on an otherwise-stock 2017 Carrera 4S

• SOUL system weighs approximately 7.9 lbs / 3.6 kg

• Factory components weigh approximately 16 lbs / 7.3 kg

• Saves approximately 8.1 lbs / 3.7 kg

• Retains factory turbocharger heat shields

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

• Smooth mandrel-bent tubing

• Heavy-duty flanges

• Fixture-tested for proper fitment

• Installation hardware included

• Detailed installation instructions included

• Direct bolt-on installation

• May trigger a catalyst-efficiency check engine light

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

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

3-INCH STRAIGHT-THROUGH DESIGN:

SOUL selected:

3-inch-diameter piping

for the Cat Bypass Pipes to maximize available exhaust flow downstream of the turbochargers.

With the PSE valves open, the Cat Bypass Pipes provide a direct, straight-through route into the factory Porsche Sport Exhaust.

Removing the catalyst substrate eliminates one of the largest restrictions in the post-turbo exhaust system.

Benefits include:

• Reduced exhaust restriction

• Greater exhaust-flow capacity

• Improved turbocharger sound

• Greater exhaust volume

• Sharper throttle response

• Increased power potential

• Improved compatibility with higher-output ECU calibrations

POST-TURBO BACKPRESSURE REDUCTION:

On a turbocharged engine, reducing restriction downstream of the turbine can be particularly beneficial.

The turbine must exhaust spent gases into the exhaust system after extracting energy to drive the compressor.

Reducing downstream restriction helps reduce the pressure the turbine must work against.

The SOUL Cat Bypass Pipes therefore target one of the most restrictive sections of the 991.2 Carrera exhaust system—the catalytic converters immediately downstream of the turbochargers.

DYNO-TESTED PERFORMANCE:

SOUL worked with AWE Tuning to independently dyno test its development car.

The test vehicle was a:

2017 Porsche 991.2 Carrera 4S

with:

No other modifications

SOUL reports maximum gains of approximately:

+20 wheel horsepower

and

+21 lb-ft of torque

at approximately:

5,800 RPM

At peak output, SOUL reports approximately:

+10 wheel horsepower

and

+14 lb-ft of torque

compared with the stock catalytic converters.

This makes the Cat Bypass Pipes one of the 991.2 Carrera products for which SOUL provides a controlled, hardware-only before-and-after performance comparison.

MAXIMUM GAIN VS. PEAK GAIN:

The two published sets of numbers describe different points on the dyno graph.

Maximum Difference Between Curves:

• +20 whp

• +21 lb-ft

• Occurs around 5,800 RPM

Difference at Peak Output:

• Approximately +10 whp

• Approximately +14 lb-ft

The larger 20-whp figure therefore should not be described as a 20-whp increase in peak horsepower.

It represents the maximum improvement between the stock and modified power curves at a particular engine speed.

TUNED PERFORMANCE POTENTIAL:

SOUL also references a separately modified Carrera tested by BoostAddict.

That vehicle increased from approximately:

344 whp / 326 lb-ft

to:

455 whp / 448 lb-ft

with:

• SOUL Cat Bypass Pipes

• Race-gas ECU calibration

Those figures demonstrate the airflow potential available when the Cat Bypass Pipes are incorporated into a more aggressive tuned configuration.

They should not be interpreted as the power increase produced by the Cat Bypass Pipes alone.

The appropriate hardware-only result remains SOUL's approximately +20 whp / +21 lb-ft maximum differential from the otherwise-stock 2017 Carrera 4S test.

THROTTLE RESPONSE:

SOUL specifically identifies improved throttle response as one of the most noticeable performance benefits.

Reducing restriction immediately after the turbochargers allows the engine and turbo system to respond more freely to changes in throttle demand.

Drivers can expect:

• Sharper engine response

• More immediate turbo sound

• Stronger midrange acceleration

• Increased sensation of engine performance

Actual response will vary with vehicle model, transmission, calibration, and other modifications.

DRAMATICALLY INCREASED TURBO SOUND:

Removing the factory catalytic converters allows considerably more turbine sound to escape through the exhaust.

Expect a substantial increase in:

• Turbo spool sound

• Turbo whistle

• Turbine-related exhaust noise

• Throttle-related acoustic feedback

• Deceleration crackles

• Overall engine character

The effect is considerably greater than what can typically be achieved by changing only the rear muffler.

EXHAUST SOUND:

The Cat Bypass Pipes substantially change the character of the turbocharged 991.2 Carrera.

With PSE open, expect:

• Dramatically increased turbocharger sound

• Increased exhaust volume

• Stronger acceleration tone

• More pronounced pops and crackles

• More aggressive Sport / Sport Plus character

• Greater mechanical presence

• Stronger throttle-related response

Removing the catalyst substrate also makes downstream exhaust changes significantly more noticeable.

RETAINS FACTORY PSE FUNCTIONALITY:

Although the catalytic converters are removed, the factory Porsche Sport Exhaust system remains downstream.

The original:

• PSE mufflers

• Exhaust valves

• PSE button

• Porsche valve-control logic

continue to function normally when the factory rear exhaust is retained.

SOUL specifically designed the Cat Bypass Pipes around this dual-mode architecture.

PSE OPEN:

With the exhaust valves open, SOUL provides a straight-through 3-inch flow path designed to maximize performance and sound.

This configuration produces the strongest:

• Turbo sound

• Exhaust volume

• Crackles and pops

• Performance character

• High-load exhaust flow

SOUL specifically states that maximum valves-open flow was a key design goal.

PSE CLOSED:

SOUL also positioned the secondary tubing into the Porsche Sport Exhaust to maintain a more civil and refined valves-closed character.

With PSE closed, expect:

• Significantly reduced exhaust volume compared with PSE open

• More subdued turbo and exhaust sound

• Better neighborhood usability

• Improved cruising refinement

• Retention of meaningful sound control despite catalyst removal

This gives a catless car considerably more flexibility than a fully open, non-valved exhaust configuration.

8.1-LB WEIGHT REDUCTION:

SOUL publishes the following weights:

Factory Catalytic-Converter Components:
Approximately 16 lbs

SOUL Cat Bypass Pipes:
Approximately 7.9 lbs

Weight Savings:
Approximately 8.1 lbs / 3.7 kg

That represents a reduction of approximately:

51%

from the components being replaced.

RETAINS FACTORY TURBO HEAT SHIELDS:

SOUL deliberately designed the Cat Bypass Pipes to retain Porsche's original turbocharger heat shields.

This preserves the factory heat-management strategy around:

• Turbochargers

• Engine-bay components

• Wiring

• Hoses

• Adjacent components exposed to post-turbo exhaust heat

This is particularly important because exhaust temperatures can remain extremely high even after the catalytic converters have been removed.

.065-INCH T304L STAINLESS CONSTRUCTION:

Each Cat Bypass Pipe is fabricated from:

.065-inch-wall T304L stainless steel

with smooth mandrel bends and substantial flanges.

This construction provides:

• High-temperature resistance

• Corrosion resistance

• Structural strength

• Consistent internal geometry

• Long-term durability

Each assembly undergoes SOUL's in-house quality-control process before shipment.

DIRECT BOLT-ON INSTALLATION:

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

Each set is fixture-tested before shipment to verify proper fitment.

SOUL includes:

• Required installation hardware

• Detailed installation instructions

The installation is designed to be manageable for experienced DIY enthusiasts with the appropriate tools and mechanical experience.

WITH FACTORY PSE REAR EXHAUST:

Pairing the Cat Bypass Pipes with the factory rear exhaust provides:

• Major increase in turbocharger sound

• Increased exhaust volume

• Measurable power gains

• Retained Porsche exhaust valves

• Retained PSE sound control

• Factory rear-muffler appearance

This is a relatively simple way to significantly change the character and performance of a PSE-equipped 991.2 Carrera.

WITH SOUL VALVED EXHAUST:

Combining the Cat Bypass Pipes with SOUL's Valved Exhaust creates a substantially higher-flowing system while preserving active sound control.

This combination provides:

• 3-inch Cat Bypass Pipes

• 3-inch valves-open rear X-pipe

• Reduced post-turbo restriction

• Significantly increased turbo sound

• Aggressive exhaust volume

• Factory-controlled valve functionality

• Resonated quieter secondary rear-exhaust path

The complete system will be substantially louder than the Valved Exhaust with factory catalytic converters.

WITH SOUL X-PIPE EXHAUST:

Combining the Cat Bypass Pipes with SOUL's non-valved X-Pipe creates an especially aggressive exhaust configuration.

This combines:

• Catless 3-inch post-turbo piping

• Non-valved 3-inch rear exhaust

• Chambered X-pipe

• Helmholtz anti-drone architecture

• Maximum consistent exhaust presence

• Reduced rear exhaust-system weight

Because there is no dedicated quiet rear-exhaust path, this combination will provide substantially more constant exhaust volume than the Valved system.

CAT BYPASS PIPES VS. SPORT CATALYTIC CONVERTERS:

SOUL Cat Bypass Pipes

• $1,795.00

• Completely catless

• 3-inch piping

• Maximum manufacturer-tested gain of +20 whp / +21 lb-ft

• Approximately 8.1 lbs lighter than factory

• Maximum turbocharger sound

• Greater exhaust volume

• May trigger a check engine light

• More competition-focused configuration

SOUL Sport Catalytic Converters

• $3,715.00

• Retain high-flow catalytic converters

• Manufacturer-tested maximum gain of approximately +14 whp / +15 lb-ft

• Approximately 3.2 lbs lighter than factory

• Increased turbo and exhaust sound

• Developed to avoid catalyst-related check engine lights

• More street-oriented configuration

For customers prioritizing maximum flow, sound, weight reduction, and value, the Cat Bypass Pipes are the more aggressive option.

For customers wanting increased performance while retaining catalytic converters, the Sport Catalytic Converters are the more appropriate configuration.

CHECK ENGINE LIGHT:

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

SOUL explicitly states that this product:

may trigger a check engine light.

SOUL recommends a suitable custom ECU calibration to disable catalyst-related faults for closed-course use.

A tune is not required for the Cat Bypass Pipes to physically bolt onto the vehicle, but should be considered when catalyst-related CEL management is necessary.

ECU TUNING:

The Cat Bypass Pipes can be mechanically installed on an otherwise-stock car.

However, an appropriate ECU calibration can provide two additional benefits:

• Manage catalyst-related diagnostic faults

• Take greater advantage of the increased exhaust-flow capability

SOUL's hardware-only dyno results were obtained without other modifications, demonstrating that the pipes themselves can provide measurable gains.

More aggressive tuned results should always be evaluated in the context of the complete vehicle setup, fuel, and calibration.

EMISSIONS / COMPETITION USE NOTE:

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

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

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

Customers are responsible for determining legal compliance for their vehicle and intended use.