Fabspeed Exhaust

Fabspeed Valved Center Muffler Bypass X-Pipe (Valved Exhaust Only). Cars with PSE from factory

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

Fabspeed Maxflo Performance Side Exhaust System.



Increase power and save weight with a throatier and deeper exhaust note throughout the RPM range; available with Black Chrome or Polished Deluxe Quad-Style Tips

The 991 Carrera Maxflo Performance Side Exhaust replaces the factory side mufflers, improving the exhaust flow and the overall power while providing a deap and throaty sports car sound. This system can be used with the OEM outlet tips, or can be upgraded to include Deluxe Quad-Style Tips in either Black Chrome or Polished finish.

Fabspeed recommends using these Side Mufflers in conjunction with a Center Muffler Bypass X-Pipe for non-PSE equipped cars. There is not a significant sound advantage to using these Side Mufflers alone in conjunction with the factory non-PSE center muffler.

FEATURES:
• Fits all Porsche 991 Carrera vehicles (2012+)
• Designed to be compatible with factory/OEM headers and center muffler (NOTE: Please call/contact us if you're interested in combining this system with additional Fabspeed exhaust components.)
• Saves 1 lb versus the factory components
• Improves sports car sound and power throughout the RPM range; 15 whp and 11 ft-lbs of torque
• Constructed from high-quality 14-16 gauge C.N.C. mandrel-bent T304L stainless steel for optimum flow and maximum durability
• Direct bolt-on replacements for the factory side mufflers
• Compatible with Fabspeed's Deluxe Quad-Style Tips in Polished or Black Chrome finish for most models); also compatible with OEM tips
• Backed by Fabspeed's Lifetime Limited Warranty

Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.

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Related, superseded, cross reference or alternative numbers for comparison.

FSPOR991MAX

The product you are viewing cross references to these numbers

Supersport X-Pipe Exhaust System.

Increase power and save weight with a throatier and deeper exhaust note throughout the RPM range, plus upgrade the style of your 991 Carrera with our Deluxe Quad Style Tips in your finish of choice for a more aggressive and refined look.

NOTE: For vehicles equipped with Porsche Sport Exhaust (PSE), this product replaces the factory center muffler PSE system. As such, the "exhaust sound option button" will no longer be functional.

FEATURES:
•   Fits all Porsche 991 Carrera vehicles 2012+
•   Saves 11.45 lbs. / 5.2 kg versus the factory components
•   Dramatic improvement in sports car sound and power throughout the RPM range; over 27 whp and 38 ft-lbs of torque
•   Constructed from high-quality 14-16 gauge C.N.C. mandrel-bent T304L stainless steel for optimum flow and maximum durability
•   Direct bolt-on replacements for the factory mufflers
•   Includes Deluxe Quad-Style Tips
•   Fabspeed Lifetime Limited Warranty

Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.

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

FSPOR991SSX

The product you are viewing cross references to these numbers

Fabspeed's Valvetronic Exhaust System replaces the restrictive OEM side mufflers and center muffler for a deeper, throatier exhaust note along with improved power and throttle response. With valves open, unleash a bold roar from your 991.

INCLUDES:
• 991 Carrera Maxflo Performance Side Mufflers w/ Deluxe Quad-Style Tips
• 991 Carrera Valvetronic Center Muffler Bypass X-Pipe

FEATURES:
• Fits: all Porsche 991 Carrera and Carrera S vehicles 2012+
• Massive power gains at low RPM,
• Saves 13 lbs. versus the factory components
• Dramatic improvement in sports car sound and power throughout the RPM range
• Constructed from high-quality 14-16 gauge C.N.C. mandrel-bent T304L stainless steel for optimum flow and maximum durability
• All included Fabspeed components are direct bolt-on replacements for the factory counterparts
• Sport Headers feature C.N.C. mandrel-bent equal length primary pipes utilizing a 3-into-1 high velocity investment-cast pyramidal merge collector
• Does not trigger a CEL and complies with most emissions regulations
• Package includes Deluxe Quad-Style Tips, constructed from T304L stainless steel
• All Fabspeed performance products are backed by the Fabspeed Lifetime Limited Warranty

Please note: This is a special-order item manufactured to order. In some cases, please allow 4 – 5 weeks for the delivery. Special order items cannot be cancelled from this supplier once your order has been placed.

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

FSPOR991VES

The product you are viewing cross references to these numbers