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- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
The Fabspeed Valved Center Muffler Bypass X-Pipe is a performance exhaust upgrade designed for 2012–2016 Porsche 991 Carrera 3.4L and Carrera S 3.8L models equipped with the factory valved exhaust system.
Fits:
- Porsche 991.1 Carrera C2 3.4L /3.8L 2012-16
- Porsche 991.1 Carrera C4 3.4L / 3.8L 2012-16
The system replaces the restrictive factory centre muffler with a freer-flowing X-pipe while retaining the functionality of the Porsche valved exhaust arrangement. This allows the driver to continue benefiting from two distinct exhaust characteristics: a more aggressive sports-car sound with the valves open and a smoother, quieter tone with the valves closed.
Manufactured from 14–16 gauge CNC mandrel-bent T304L stainless steel, the X-pipe is designed to improve exhaust flow, reduce weight and provide long-term resistance to corrosion and high exhaust temperatures.
Fabspeed reports gains of approximately:
- +16 wheel horsepower
- +14 lb-ft of torque
- 12 lb weight reduction compared with the factory centre muffler
Actual performance gains can vary depending on vehicle condition, specification, fuel and environmental conditions.
What This Product Does:
The factory centre muffler helps control exhaust volume but also creates a degree of restriction in the exhaust path.
The Fabspeed X-pipe replaces this muffler with a freer-flowing crossover section, allowing exhaust gases from the two cylinder banks to merge and flow more efficiently toward the rear exhaust outlets.
Its main functions and benefits include:
- Reducing centre-muffler exhaust restriction
- Improving exhaust gas flow
- Increasing exhaust sound and character
- Retaining factory exhaust-valve operation
- Supporting improved throttle response
- Producing measurable horsepower and torque gains
- Reducing exhaust-system weight
- Providing a more direct flat-six exhaust note
- Maintaining compatibility with factory valved side mufflers
Fabspeed also lists the X-pipe as a suitable complement to its Maxflo Performance Side Exhaust System.
Symptoms Of Wear Or Failure:
The factory centre muffler and associated valved-exhaust components are exposed to heat, condensation, vibration and repeated thermal cycling.
Common signs of deterioration can include:
- Exhaust rattling from the centre muffler
- Internal muffler components becoming loose
- Cracked exhaust seams or welds
- Blowing or hissing noises
- Black soot around leaking joints
- Corrosion on pipes or muffler sections
- Exhaust-valve rattling
- Valve mechanism sticking open or closed
- Uneven exhaust sound between operating modes
- Failure to change exhaust tone when the valve system is activated
- Loose clamps or mounting hardware
- Excessive exhaust movement
- Poor exhaust alignment
- Unexpected increase in exhaust noise
Some valve-related symptoms may originate from actuators, vacuum lines or electronic controls rather than the exhaust pipework itself, so the complete system should be inspected before replacement.
Why Replacement Matters:
A deteriorated muffler or leaking exhaust connection can allow hot exhaust gases to escape before reaching the intended outlets.
This can lead to:
- Increased unwanted exhaust noise
- Rattles and vibration
- Soot accumulation
- Excessive heat around surrounding components
- Deterioration of adjacent exhaust joints
- Reduced exhaust-system integrity
A malfunctioning exhaust valve can also prevent the system from switching correctly between quieter and louder operating modes.
Replacing damaged components helps restore:
- Secure exhaust routing
- Leak-free exhaust connections
- Correct valve functionality
- Proper clearance from surrounding components
- Consistent exhaust operation
Where the original system remains serviceable, the Fabspeed X-pipe is primarily a performance, sound and weight-saving upgrade rather than a necessary repair.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
FSPOR991CMBXV
The product you are viewing cross references to these numbers
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
The typical Porsche sound - powerful, robust, sporty. Better still, it can be further enhanced using this sports exhaust system. The sound varies with driving behavior, ranging from a robust out put during normal road driving to a distinctively more aggressive tone during performance use.
The mode of the sports exhaust system is selected using a button in the centre console, if this button is not already pre-fitted in your car you will need to order this with us by providing the chassis / VIN number when ordering.
The package includes:
- Tailpipes made of die cast aluminum.
- Two rear mufflers
- One Centre Muffler
- Exhaust straps clamps and wiring
Fits:
Porsche 997 MKII Carrera
Porsche 997 MKII Carrera S
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99704420004
The product you are viewing cross references to these numbers
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
"Sound Version" with deep sound.
Polished stainless steel 304/4301.
Fits:
Porsche 997 MKII 3.6L-3.8L C2 / C4 / C2S / C4S 06/2008-12/2012
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99722097331S
The product you are viewing cross references to these numbers
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
Made from high quality T304 14-16 gauge stainless steel, C.N.C. mandrel bent. The X-Pipe (primary muffler bypass) gives a great exotic car sound and power by about 5 decibels.
Fits:
Porsche 997 MKII
Click 'Zoom in' for large parts diagram.
3606009719 replace No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
3606009719
The product you are viewing cross references to these numbers