Porsche 991.2 GT2 RS SOUL Cat Bypass Pipes

Product Description

The SOUL Cat Bypass Pipes are a complete catless catalyst-section upgrade for the 2018–2020 Porsche 991.2 911 GT2 RS, engineered to remove the restrictive factory catalytic converters while preserving the GT2 RS's factory-controlled dual-mode exhaust functionality.

Rather than simply replacing the catalysts with straight pipes, SOUL redesigns the complete section using 2.5-inch T304L stainless-steel tubing, larger 76 mm exhaust valves, and enlarged hand-fabricated outlet sections. The factory valves measure approximately 67 mm, giving the SOUL system a substantially larger flow path when the valves are open.

With the valves open, exhaust receives priority flow directly toward the rear exhaust outlets, dramatically increasing turbocharger sound, exhaust volume, and flow. When the valves close, exhaust continues through the factory muffler system, allowing the GT2 RS to retain a considerably more reserved sound level.

The SOUL Cat Bypass Pipes weigh approximately 11.4 lbs compared with 18.3 lbs for the factory catalyst assemblies, saving approximately 6.9 lbs / 3.1 kg from the rear of the vehicle.

FITMENT:

• Fits 2018–2020 Porsche 991.2 911 GT2 RS

• Fits all standard 991.2 GT2 RS vehicles

• Designed for the 3.8L twin-turbo flat-six

• Compatible with the factory rear muffler

• Retains the GT2 RS's valved exhaust architecture

• Compatible with the factory exhaust-valve control strategy

• Compatible with applicable SOUL GT2 RS downstream exhaust upgrades

DETAILS:

• Pair of catless Cat Bypass Pipes

• Completely replaces the factory catalytic-converter assemblies

• Retains dual-mode exhaust functionality

• Larger replacement exhaust valves

• 76 mm SOUL valves

• Factory valves approximately 67 mm

• Increased priority flow toward the exhaust-tip outlets

• 2.5-inch diameter main tubing

• Enlarged outlet geometry

• Increased post-turbo exhaust flow

• Dramatically increased turbocharger sound

• Significantly more aggressive valves-open exhaust character

• Factory muffler continues providing reduced volume with valves closed

• Approximately 11.4 lbs / 5.2 kg

• Factory catalyst components approximately 18.3 lbs / 8.3 kg

• Saves approximately 6.9 lbs / 3.1 kg

• Approximately 38% lighter than the factory components being replaced

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

• Mandrel-bent tubing

• Premium exhaust valves

• Laser-cut brackets

• Hand-fabricated outlet sections

• Back-purged welding

• Thick-gauge aluminum fabrication fixtures

• Direct bolt-on installation

• Fixture-tested before shipment

• May trigger a catalyst-related check engine light

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

• CAD designed

• Hand built in Willow Grove, Pennsylvania

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

COMPLETE CATALYTIC-CONVERTER DELETE

The factory GT2 RS places catalytic converters immediately downstream of its two large turbochargers.

Those catalyst substrates restrict exhaust flow while also absorbing a significant amount of the:

• Turbo spool

• Turbine whistle

• Exhaust pulse

• Flat-six engine character

generated by the 3.8L twin-turbo engine.

SOUL completely removes the catalyst substrates and replaces the assemblies with freer-flowing stainless-steel bypass sections.

The result is a considerably less restrictive exhaust path immediately after the turbochargers.

NOT JUST A STRAIGHT CAT-DELETE PIPE

The GT2 RS Cat Bypass Pipes are more sophisticated than a conventional straight catalyst-delete pipe.

The factory catalyst section is integrated into the vehicle's valved exhaust architecture.

SOUL therefore replaces not only the catalyst section but also incorporates:

• Larger exhaust valves

• Revised flow routing

• Enlarged outlet geometry

• Mounting brackets

• Connections to the factory muffler path

This preserves the GT2 RS's ability to behave very differently depending on valve position.

76 MM SOUL EXHAUST VALVES

SOUL increases exhaust-valve diameter from approximately:

67 mm factory

to:

76 mm SOUL

This represents roughly a:

13% increase in valve diameter

and a substantially greater available flow area when the valve is fully open.

A larger valve reduces the restriction presented at one of the most important junctions in the GT2 RS exhaust.

INCREASED VALVE FLOW AREA

Because cross-sectional area increases with the square of diameter, moving from 67 mm to 76 mm represents approximately:

29% more nominal circular valve area

before accounting for the specific internal geometry of the valve assembly.

This helps explain why SOUL focused not only on removing the catalysts but also on increasing valve size.

The goal is to avoid eliminating catalyst restriction only to leave another unnecessary restriction immediately downstream.

PRIORITY FLOW TO THE EXHAUST OUTLETS

SOUL specifically redesigned the system so that, with the valves open, exhaust receives greater priority toward the direct exhaust-tip outlets.

This increases:

• Exhaust flow

• Exterior volume

• Turbocharger sound

• Engine character

• High-load exhaust presence

The system therefore makes full use of the valves-open operating condition rather than merely replicating the factory routing with the catalyst substrate removed.

VALVES OPEN

When the exhaust valves open, expect a dramatic transformation in the GT2 RS's sound.

The removal of the catalysts allows substantially more:

• Turbo spool

• Turbo whistle

• Turbine sound

• Exhaust pulse

• Flat-six character

• High-RPM exhaust volume

to reach the rear outlets.

SOUL describes the result as a motorsport-inspired roar with a particularly pronounced turbocharger note.

VALVES CLOSED

Despite the aggressive catless configuration, the GT2 RS retains a useful quieter operating mode.

With the valves closed, exhaust continues through the factory rear muffler.

This keeps overall volume and exhaust tone considerably more reserved than the valves-open configuration.

That makes these Cat Bypass Pipes fundamentally different from a completely unmuffled straight-pipe system.

FACTORY-CONTROLLED VALVE BEHAVIOR

Under normal operation, Porsche's ECU continues controlling exhaust-valve behavior.

The vehicle can therefore determine when the valves open or close based on its factory programming.

Customers seeking full manual control over valve position may use a compatible aftermarket valve controller.

This can be particularly useful for drivers who want the valves fully open independently of Porsche's factory strategy.

TURBOCHARGER SOUND

The 991.2 GT2 RS uses a 700-horsepower 3.8L twin-turbocharged flat-six.

The factory catalyst assemblies substantially attenuate the acoustic signature of those turbochargers.

Removing the catalyst substrates makes considerably more of the following audible:

• Compressor and turbine activity

• Turbo spool

• High-load turbine whistle

• Throttle transitions

• Boost-related sound

For many GT2 RS owners, this is one of the most noticeable changes produced by the Cat Bypass Pipes.

MORE AGGRESSIVE FLAT-SIX CHARACTER

The catalyst removal also allows more combustion and exhaust-pulse energy to reach the rear of the vehicle.

Expect:

• Louder acceleration

• More high-RPM intensity

• Greater throttle-related feedback

• Stronger shift events

• More pronounced deceleration behavior

• Increased motorsport character

Overall sound will depend on what downstream muffler or exhaust system is installed.

2.5-INCH MAIN TUBING

SOUL constructs the primary bypass sections from:

2.5-inch-diameter tubing

The design is focused on maximizing the available flow through the catalyst section while maintaining proper packaging around the GT2 RS's turbocharger and rear-exhaust architecture.

ENLARGED OUTLET DESIGN

In addition to the larger 76 mm valves, SOUL enlarges the exhaust outlet geometry leading toward the rear tip path.

The goal is to increase flow through the path that becomes active when the exhaust valves open.

This works together with:

• Catalyst deletion

• Larger valves

• Revised internal routing

• CAD-developed geometry

to reduce restriction throughout the complete assembly.

REDUCED POST-TURBO RESTRICTION

The turbine side of each turbocharger must discharge exhaust into the downstream exhaust system.

Removing restrictive catalyst substrates reduces the pressure the exhaust encounters immediately downstream of the turbine.

This provides additional exhaust-flow capacity for:

• Factory power levels

• ECU-tuned vehicles

• Increased boost

• Higher-output builds

• Modified intake and cooling systems

• Other supporting engine upgrades

6.9-LB WEIGHT REDUCTION

SOUL publishes the following weights:

Factory Catalyst Assemblies:
Approximately 18.3 lbs / 8.3 kg

SOUL Cat Bypass Pipes:
Approximately 11.4 lbs / 5.2 kg

Weight Savings:
Approximately 6.9 lbs / 3.1 kg

This represents approximately a:

38% reduction

in the weight of the components being replaced.

Because the components are positioned at the rear of a rear-engined vehicle, the weight reduction is particularly useful for a track-focused platform such as the GT2 RS.

.065-INCH T304L STAINLESS CONSTRUCTION

The Cat Bypass Pipes are fabricated from:

.065-inch-wall T304L stainless steel

T304L provides:

• High-temperature durability

• Corrosion resistance

• Structural strength

• Consistent fabrication characteristics

• Long service life

• Suitability for repeated track heat cycles

MANDREL-BENT TUBING

The tubing is mandrel bent to maintain the intended internal cross-sectional area through bends.

This helps preserve:

• Consistent exhaust diameter

• Smooth flow paths

• Exhaust-gas velocity

• Predictable fitment

HAND-FABRICATED OUTLET PIPES

SOUL hand fabricates the outlet sections to create the geometry required around the GT2 RS's valved exhaust layout.

These outlet sections are particularly important because they control how exhaust is divided between the direct outlet and factory muffled route.

PREMIUM EXHAUST VALVES

The SOUL assemblies incorporate their own larger premium exhaust valves as part of the replacement catalyst sections.

The valves are therefore an integrated part of the Cat Bypass Pipe design rather than a separate accessory.

LASER-CUT BRACKETS

Precision laser-cut brackets are used to locate and support the assemblies within the tight packaging of the GT2 RS rear chassis.

Accurate bracket geometry helps maintain:

• Exhaust alignment

• Valve alignment

• Muffler-path positioning

• Tip-path positioning

• Chassis clearance

BACK-PURGED WELDING

SOUL back purges the tubing during welding.

Protecting the interior of the stainless tubing with shielding gas helps prevent excessive oxidation and promotes:

• Cleaner internal weld surfaces

• Proper weld penetration

• Improved long-term durability

• Consistent exhaust flow

THICK-GAUGE ALUMINUM FABRICATION FIXTURES

Each set is constructed in a thick-gauge aluminum fixture.

The fixture helps act as a heat sink during fabrication and reduces distortion caused by the substantial heat introduced during welding.

This helps maintain:

• Valve position

• Flange alignment

• Pipe geometry

• Outlet positioning

• Repeatable vehicle fitment

FIXTURE-TESTED BEFORE SHIPPING

Each completed assembly undergoes a fitment and quality-control inspection before shipment.

SOUL verifies the system in its production fixture and foam packs the finished components to protect them during transport.

DIRECT BOLT-ON INSTALLATION

The Cat Bypass Pipes are designed to replace the factory catalyst assemblies without requiring permanent chassis modification.

No cutting or welding should be necessary during normal installation.

The system interfaces with the vehicle's existing:

• Turbocharger outlets

• Rear exhaust

• Muffler architecture

• Exhaust-valve controls

CHECK ENGINE LIGHT

Because the SOUL Cat Bypass Pipes completely remove the factory catalytic converters, the vehicle may detect that catalyst functionality is no longer present.

SOUL explicitly states that the product:

may trigger a check engine light.

DasMotoring therefore does not advertise this product as CEL-free.

ECU TUNING

An ECU calibration is not required for the physical installation of the Cat Bypass Pipes.

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

Tuning may also allow the engine calibration to take greater advantage of the reduced post-turbo restriction.

NO PUBLISHED STANDALONE DYNO NUMBER

SOUL states that the revised system increases exhaust flow and power potential.

However, the current product page does not publish a controlled factory-catalyst versus Cat-Bypass before-and-after dyno comparison.

DasMotoring therefore does not advertise a specific horsepower or torque gain for this product alone.

CAT BYPASS PIPES VS. SPORT CATALYTIC CONVERTERS

SOUL Cat Bypass Pipes

• $4,555.00

• Completely catless

• 2.5-inch T304L main tubing

• 76 mm exhaust valves

• Maximum catalyst-section sound

• Maximum catalyst-section flow

• Approximately 11.4 lbs

• Saves approximately 6.9 lbs

• May trigger catalyst-related CELs

• Competition-oriented configuration

SOUL Sport Catalytic Converters

• Retain high-flow catalytic converters

• Retain dual-mode valve functionality

• More conservative emissions configuration

• Increased flow compared with the factory catalysts

• Less aggressive turbocharger sound

• Greater purchase price

• More street-oriented configuration

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

CAT BYPASS PIPES VS. RACE PIPES

SOUL also offers separate Race Pipes for the 991.2 GT2 RS.

The Cat Bypass Pipes replace the catalyst sections while retaining the factory-style dual-path exhaust architecture and valves.

The Race Pipes are a separate downstream component and should not be confused with these catalyst-delete assemblies.

The two components can be selected independently depending on the customer's desired sound, flow, and overall exhaust configuration.

EMISSIONS / COMPETITION USE NOTE

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

This configuration is intended for closed-course / competition use where catalyst retention is not required.

Use on an emissions-controlled vehicle operated on public roads may violate applicable emissions regulations.

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