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- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
Bypass pipes for side mufflers.
Fits
Porsche 911 GT3 and GT3 RS (991.1 and 991.2 2014-2019)
RACETRACK USE ONLY
These components are designed and developed for racetrack use and to maximise the car's performance. They are not street legal and must be installed by professionals in the sector
Material: Stainless Steel 304
Replacement for Genuine muffler 991.111.048.81
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606609145
The product you are viewing cross references to these numbers
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
Bypass pipes for side mufflers.
Fits
Porsche 911 GT3 and GT3 RS (991.1 and 991.2 2014-2019)
RACETRACK USE ONLY
These components are designed and developed for racetrack use and to maximise the car's performance. They are not street legal and must be installed by professionals in the sector
Material: Stainless Steel 304
Replacement for Genuine muffler 991.111.048.81
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606609140
The product you are viewing cross references to these numbers
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
The Fabspeed Center Muffler Bypass X-Pipe is a high-performance exhaust upgrade developed specifically for the Porsche 911 991.2 GT2 RS from 2018 onward, including Weissach and Manthey MR-equipped cars.
Fits:
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
Designed to replace the factory titanium centre muffler, the system provides a freer-flowing exhaust path while retaining the vehicle's original catalytic converters.
At the centre of the system is Fabspeed's investment-cast X-pipe. The crossover allows exhaust gases from the two sides of the engine to merge through a carefully shaped central opening, helping reduce restriction, balance exhaust flow and produce a stronger, more exotic exhaust note.
The system is manufactured from 14–16 gauge T304 stainless steel with larger-diameter CNC mandrel-bent tubing. It provides a durable alternative to the original titanium centre muffler while increasing exhaust sound and supporting improved throttle response and performance.
Fabspeed currently lists a +20 HP performance gain for this product. Actual gains can vary according to vehicle condition, fuel, environmental conditions and other modifications.
What This Product Does:
The Fabspeed X-pipe replaces the original centre muffler in the rear exhaust system.
It is designed to:
- Reduce restriction through the centre exhaust section.
- Improve exhaust gas flow.
- Replace the factory titanium centre muffler.
- Increase exhaust volume.
- Produce a more dynamic GT2 RS exhaust note.
- Improve throttle response.
- Support increased engine performance.
- Retain the original catalytic converters.
- Maintain a catalyst-equipped exhaust configuration.
- Provide a durable stainless-steel replacement for the factory centre muffler.
- Allow straightforward installation and removal using the existing clamped exhaust arrangement.
Symptoms Of Wear Or Failure:
Possible symptoms of deterioration in the original centre muffler include:
- Metallic rattling.
- Exhaust blowing noises.
- Cracks around welds.
- Visible exhaust leakage.
- Soot around damaged joints.
- Increased exhaust noise.
- Muffler casing damage.
- Loose internal components.
- Exhaust vibration.
- Exhaust hanging incorrectly.
- Damaged inlet or outlet connections.
- Exhaust contacting surrounding components.
- Heat-related structural deterioration.
A damaged muffler should be inspected before continued high-load or track use.
Why Replacement Matters:
Replacing a damaged or restrictive centre muffler section helps restore:
- Correct exhaust sealing.
- Safe routing of hot exhaust gases.
- Proper exhaust alignment.
- Structural integrity.
- Consistent exhaust flow.
- Reliable mounting.
Upgrading to the Fabspeed X-pipe additionally provides:
- Increased exhaust sound.
- Reduced centre-section restriction.
- Improved throttle response.
- A more performance-focused exhaust character.
- Retention of the factory catalytic converters.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR9912GT2RSCMX
The product you are viewing cross references to these numbers