Fabspeed Non-Valved Sport Cats. Porsche 991.2 GT2 RS (2018+)  ›  FSPOR9912GT2RSRACESC

Fabspeed Non-Valved Sport Cats. 

The Fabspeed Non-Valved Sport Cats are a high-performance exhaust and catalytic-converter upgrade developed specifically for the Porsche 911 991.2 GT2 RS from 2018 onward.

Fits:

• Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19  

Designed for owners who want significantly improved exhaust flow and a more aggressive sound while retaining catalytic converters, the system replaces the restrictive factory 700-cell ceramic catalysts and OEM titanium centre muffler with large German HJS 200-cell high-flow catalytic converters and direct rear exhaust outlets.

Unlike Fabspeed's valved GT2 RS sport-cat system, this version contains no exhaust valves. Exhaust gases therefore follow a direct, unrestricted path through the high-flow catalysts and towards the rear outlets at all times.

The HJS catalysts use a high-performance tri-metallic substrate and are designed to provide very high exhaust flow while maintaining catalytic treatment. Fabspeed states that the 200 CPSI HJS cores can flow approximately 90–93% of a straight pipe in suitable applications.

The system is fabricated from 14–16 gauge CNC mandrel-bent T304 stainless steel and includes both angle-cut outlets and slip-on 90-degree turn-down outlets.

Fabspeed currently reports hardware-only gains of:

+7 WHP

+10 lb-ft of torque

Approximately +8.5 HP and +12 lb-ft at the engine

Approximately 12 lb weight reduction

When combined with Fabspeed ECU tuning, the manufacturer also states that its test configuration has produced over 740 HP at the wheels and approximately 850–888 HP at the crank on pump fuel.

Actual performance will vary according to vehicle condition, fuel, calibration, environmental conditions and other modifications.

What This Product Does:
The Fabspeed Non-Valved Sport Cat system replaces the factory catalytic-converter and centre-muffler arrangement downstream of the GT2 RS turbochargers.

It is designed to:

• Reduce exhaust restriction.
• Replace the factory 700-cell catalysts.
• Replace the OEM titanium centre muffler.
• Retain catalytic exhaust treatment.
• Reduce post-turbo backpressure.
• Improve exhaust gas flow.
• Improve turbocharger response.
• Sharpen throttle response.
• Increase engine performance potential.
• Produce a significantly stronger exhaust note.
• Increase audible turbocharger spool and whistle.
• Reduce exhaust-system weight.
• Eliminate exhaust-valve restriction.
• Provide a direct exhaust route from the turbochargers to the rear outlets.

Symptoms Of Wear Or Failure:
Possible signs of catalytic-converter deterioration include:

• Check Engine Light.
• Catalyst-efficiency fault codes.
• Loss of engine performance.
• Sluggish throttle response.
• Slower turbocharger response.
• Engine feeling restricted under boost.
• Reduced high-RPM power.
• Increased exhaust backpressure.
• Metallic rattling from inside the catalyst.
• Unusual exhaust smells.
• Excessive catalyst temperature.
• Internal substrate breaking apart.
• Melted or collapsed catalyst material.
• Failed emissions testing where applicable.

Why Replacement Matters:
Replacing a failed or restricted catalytic converter helps restore:

• Correct exhaust flow.
• Turbocharger efficiency.
• Engine performance.
• Exhaust-system sealing.
• Reliable catalytic operation.

Upgrading to the Fabspeed system additionally provides:

• Significantly reduced catalyst restriction.
• Improved throttle and turbo response.
• More aggressive exhaust sound.
• Lower exhaust-system weight.
• Durable stainless-steel construction.
• Catalytic treatment without a fully catalyst-free race-pipe configuration.

NOTE: In the United Kingdom, sports catalytic converters and bypass pipes do not have type approval and are not legally permitted for use on vehicles manufactured after 1st March 2001. They are not MOT compliant and cannot be used on public roads. These components are intended solely for race and track use.

For vehicles manufactured before 1st March 2001, a non-type approved sports catalytic converter may be fitted, provided it offers comparable performance to the original and the vehicle continues to meet the applicable emissions standards for its age. The vehicle must still pass an MOT test.

If you are located outside the UK, please check your local laws and regulations to ensure compliance.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

FSPOR9912GT2RSRACESC

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