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Fabspeed Exhaust

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FSPOR991MHSC
Product Information
Product Information
Fabspeed RENNKRAFT Modular Headers With HJS Catalytic Converters.

The Fabspeed Porsche 991 Carrera RENNKRAFT Modular Headers with HJS Catalytic Converters are a high-performance exhaust manifold and sport-catalyst upgrade developed for Porsche 991 Carrera models from 2012–2016.

Fits:

  • Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16  

Fabspeed’s patented
RENNKRAFT® modular design combines performance headers with removable catalyst sections connected by quick-release V-band clamps. In the road-oriented configuration, the system uses German HJS HD tri-metallic 200-cell catalytic converters to provide high exhaust flow while retaining catalytic exhaust treatment.

The headers are manufactured from CNC mandrel-bent T304L stainless steel and incorporate F1-style high-velocity merge collectors intended to improve exhaust scavenging. Fabspeed states that the system was developed from 3D scans of the original Porsche headers to achieve accurate bolt-on fitment.

For a mechanically healthy Porsche, this system is primarily a performance, exhaust-flow and sound upgrade rather than a maintenance replacement.

What This Product Does:

  • The exhaust headers collect gases leaving each cylinder and route them toward the catalytic converters and the rest of the exhaust system.
  • The factory headers must balance manufacturing cost, packaging, emissions performance, noise control and exhaust flow. The Fabspeed RENNKRAFT system is designed to provide a less restrictive route while improving the way exhaust pulses merge.
  • Fabspeed states that the system provides +25 horsepower and +20 lb-ft of torque. These are Fabspeed-published figures from its testing and actual gains may vary according to vehicle condition, fuel, ambient conditions and the remainder of the exhaust system.
  • The header system is designed to improve exhaust flow, enhance scavenging, produce a more aggressive exhaust note and create a modular platform that allows catalyst sections to be serviced or changed independently.

Symptoms Of Wear Or Failure:
  • Factory exhaust headers are exposed to extremely high temperatures and repeated heating and cooling cycles.
  • Possible signs of deterioration include exhaust ticking when cold, blowing or hissing noises, visible cracks, damaged welds, loose flange hardware, black soot around leaking joints, unusual exhaust smells, metallic rattling, increased engine-bay exhaust noise or reduced performance caused by leakage or restriction.
  • Leaks often become more noticeable during cold start because gaps can change as the exhaust system reaches operating temperature.
  • Catalytic converters can deteriorate through mileage, excessive heat, contamination or underlying engine problems.
  • Potential symptoms include a Check Engine Light, catalyst-efficiency fault codes, reduced high-RPM performance, sluggish acceleration, excessive exhaust heat, metallic rattling from inside the catalyst, unusual exhaust smells or a feeling that the engine is unable to breathe freely at higher loads.
  • A physically damaged catalyst substrate can break apart or melt, potentially creating exhaust restriction.

Why Replacement Matters:
  • A leaking or cracked exhaust header can allow hot exhaust gases to escape before they reach the remainder of the exhaust system.
  • This can lead to increased noise, inaccurate oxygen-sensor readings, reduced engine performance and unnecessary heat around nearby components.
  • A blocked or damaged catalytic converter can create excessive exhaust restriction. On a naturally aspirated engine such as the 991.1 Carrera, restriction can reduce the engine’s ability to evacuate exhaust gases efficiently and may result in reduced power, poor high-RPM response and increased exhaust temperatures.
  • Replacing worn or failed components restores a sealed and properly flowing exhaust path.
  • If the original components are still healthy, however, fitting the Fabspeed RENNKRAFT system is mainly a performance and sound upgrade.


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.

FSPOR991MHSC
99111341102
99111341104
99111341202
91111341204

The product you are viewing cross references to these numbers
FSPOR991GT3RSM
Product Information
Product Information
Fabspeed Rennsport Muffler. 

The ULTIMATE OEM style high performance replacement muffler for your GT3

FEATURES:

•   Fits all Porsche 991 GT3 / GT3 RS vehicles 2014-2016 worldwide
•   Constructed from CNC cut T304L stainless steel
•   Designed from 3D scans of the OEM muffler so we can achieve perfect bolt-on fitment
•   Will not break or crack like OEM GT3 mufflers do
•   Incorporates our signature cast X-pipe for superior flow and exhaust scavenging
•   Paired with our Side Muffler Bypass Pipes this muffler adds +27 ft/lbs of TQ and +16 WHP or +18 HP at the crank!
•   4 different tip options available
•   Completely retains PSE valved exhaust functionality
•   No Check Engine Light guaranteed
•   This cat-back system is emissions legal in all 50 states and the rest of the world
•   Built in house at Fabspeed Motorsport USA in Fort Washington, PA
•   Simple bolt-on installation, no cutting or welding required
•   All Fabspeed performance products are backed by the Fabspeed Lifetime Warranty

As many GT3 owners know, the OEM mufflers are prone to cracking, breaking and blowing out, particularly the titanium mufflers on GT3RS cars. We wanted to design a muffler replacement that not only fixed that issue but also improved on the OEM design. Using our 25+ years of air and water-cooled experience, we took the valve open tubing to 2.75in / 70mm which is the optimal diameter for GT3 engines to have low restriction but maintain high velocity and high GT3 pitch for the signature GT3 CUP car sound. Then, we implemented our signature investment cast X-Pipe for optimal exhaust scavenging. The X merges the two cylinder banks without creating any restriction in exhaust flow. To maintain the factory muffler’s exhaust note and lack of drone, we mimicked Porsche’s 7 chamber design. This makes for a completely drone free muffler, even when running catless race headers! Pair this with Fabspeed Side Muffler Muffler Bypass Pipes for the ultimate emissions compliant GT3 exhaust. This muffler is guaranteed to NEVER BREAK or fail.

SOUND:
This muffler will have a very similar tone to the OEM muffler, however, it will be a bit louder with PSE turned on. It will also sound a bit smoother and higher pitched thanks to our signature X-pipe.

POWER:
On our 991.1 GT3RS test car, paired with Fabspeed Side Muffler Muffler Bypass Pipes, the Rennsport Muffler picked up an impressive 27 ft/lbs of TQ down low at 3,200 RPM. From 2,900 RPM all the way to 5,700 RPM it picks up 10 WHP or more, and peak WHP is up from 446 to 454! That’s a gain of 8 WHP or 9 HP at the crank.

NOTE:
•   Requires OEM gaskets and hardware to be reused
•   If they are not available here are the necessary part numbers. 
•     2x Muffler band straps (99711111970)
•     2x Bolt for muffler band strap (90006736201)
•     2x Each Side Muffler to Center Muffler Gaskets (99711156390, 99711156190)  

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.

FSPOR991GT3RSM
FS.POR.991GT3.RSM
99111102790
99711102792
99711102799

The product you are viewing cross references to these numbers
FSPOR997CUPSHDR
Product Information
Product Information
Fabspeed Sport Headers.

The Fabspeed Porsche 911 GT3 Cup Sport Headers are a high-performance replacement for the restrictive factory exhaust headers fitted to 997 and 991.1-generation Porsche 911 GT3 Cup race cars from 2007–2016.

Fits:

  • Porsche 997 MK1 GT3 CUP 2007-09
  • Porsche 911 (997) GT3 CUP 2010
  • Porsche 991 GT3 Cup 2016

Designed specifically for competition-focused GT3 Cup applications, the system improves exhaust gas flow and scavenging to help the naturally aspirated flat-six engine breathe more efficiently throughout the rev range. The result is improved throttle response and the potential for increased power and torque.

Each header assembly incorporates German-made 200-cell HJS tri-metallic high-flow sport catalytic converters. These performance catalysts are designed to offer substantially less exhaust restriction than conventional catalysts while retaining catalytic treatment of the exhaust gases.

The headers are manufactured from high-quality 14–16 gauge stainless steel using CNC mandrel-bent tubing and feature high-velocity 3-into-1 pyramidal investment-cast merge collectors. This collector design is intended to improve exhaust scavenging as the individual cylinder exhaust pulses combine.

Fabspeed lists gains of up to 22 HP and 37 units of torque for this product, although actual results depend on the vehicle, engine specification, environmental conditions and accompanying modifications. The manufacturer also lists a reduction in weight compared with the factory arrangement.

What This Product Does:
The exhaust headers collect exhaust gases leaving each cylinder and direct them towards the remainder of the exhaust system.

On a high-revving naturally aspirated race engine such as the GT3 Cup flat-six, header design has a significant effect on the speed and efficiency with which exhaust gases leave the combustion chambers.

The Fabspeed Sport Headers are designed to:

  • Reduce restriction compared with the factory header arrangement.
  • Improve exhaust gas velocity.
  • Promote more effective cylinder scavenging.
  • Reduce exhaust backpressure.
  • Allow the engine to expel combustion gases more efficiently.
  • Improve throttle response.
  • Support increased horsepower and torque.
  • Maintain high exhaust flow at elevated engine speeds.
  • Improve performance across the usable RPM range.
  • Provide high-flow catalytic conversion through the HJS sport catalysts.

Symptoms Of Wear Or Failure:
Exhaust headers operate in an extremely demanding environment and are exposed to intense heat, vibration and repeated thermal cycling.

Possible symptoms of deteriorated factory or aftermarket headers include:

  • Ticking or tapping noises from the exhaust area.
  • Exhaust noise becoming louder than normal.
  • Exhaust gases escaping around the cylinder-head flange.
  • Soot deposits around header joints or welds.
  • Cracks in the header tubing.
  • Cracked or damaged welds.
  • Distorted exhaust flanges.
  • Loose header fasteners.
  • Damaged exhaust gaskets.
  • Rattling noises from the catalytic converters.
  • Metallic noises from loose catalyst material.
  • Reduced engine performance.
  • Slower throttle response.
  • Increased exhaust backpressure.
  • Engine-management warning lights.
  • Catalyst-efficiency fault codes.
  • Unusual exhaust smells.
  • Excessive heat around surrounding components.

Race cars should be inspected regularly because repeated high-temperature track operation can accelerate fatigue of exhaust components.

Why Replacement / Upgrading Matters:
Efficient exhaust flow is essential to extracting maximum performance from a GT3 Cup engine.

A restrictive, damaged or leaking exhaust header can interfere with exhaust scavenging and reduce engine efficiency.

Replacing worn factory components or upgrading to the Fabspeed Sport Headers can help restore or improve:

  • Exhaust gas flow.
  • Cylinder scavenging.
  • Throttle response.
  • High-RPM performance.
  • Engine breathing.
  • Power and torque potential.
  • Exhaust-system sealing.
  • Competition reliability.

For a race vehicle, consistent performance is as important as peak output. Exhaust leaks or deteriorating components can become progressively worse under sustained track temperatures.



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

FSPOR997CUPSHDR
9A11302290
9A111302291
9A111302190
9A111302191
99711302294
99711302297
99711302194
99711302197

The product you are viewing cross references to these numbers
FSPOR991TSSXXVQ
Product Information
Product Information
Fabspeed STREET Valved Supersport X-Pipe Exhaust System.

The Fabspeed Porsche 991 Turbo / Turbo S Valved Supersport X-Pipe Exhaust System is a high-performance exhaust upgrade designed to deliver enhanced exhaust sound, improved gas flow and driver-controlled exhaust volume for the Porsche 911 Turbo and Turbo S (991.1), manufactured between 2013 and 2016.

Fits:

  • Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16  


The standard Porsche 991 Turbo exhaust system is engineered to balance performance, emissions and noise regulations. Although effective for everyday driving, its factory mufflers and catalytic converter arrangement can restrict exhaust sound and reduce the audible character of the turbocharged flat-six engine.

Fabspeed developed the Valved Supersport X-Pipe Exhaust System to provide a more engaging exhaust experience while retaining the flexibility of adjustable sound control.

At the heart of the system is a specially engineered 2.75-inch (70 mm) quad-resonated X-pipe, designed to balance exhaust flow and sound characteristics.

With the exhaust valves closed, gases are directed through the resonated X-pipe, producing a smoother, more controlled exhaust note suitable for lower-noise driving.

When the valves are opened, exhaust gases bypass the resonated X-pipe section, creating a more direct flow path and producing a substantially louder, more aggressive exhaust sound.

This dual-mode configuration allows the driver to enjoy two distinct exhaust characteristics from one system.

Manufactured from 14–16 gauge T304L stainless steel, the exhaust uses CNC mandrel-bent tubing to maintain consistent internal pipe diameter and smooth gas flow.

The system incorporates high-quality Helical vacuum-operated exhaust valves, engineered to withstand the high temperatures and demanding operating conditions associated with turbocharged performance engines.

Available with either high-flow sports catalytic converters or race-only catalytic converter bypass pipes, the system can be configured for different performance requirements and intended applications.

The exhaust is completed with Fabspeed's deluxe quad-style exhaust tips, available in a choice of finishes to complement the Porsche 991 Turbo's rear styling.

Designed as a bolt-on replacement, the system can be installed without cutting or welding, making it a substantial exhaust upgrade for enthusiasts seeking improved sound, performance potential and premium construction.

What This Product Does:
The Fabspeed Valved Supersport X-Pipe replaces the corresponding factory exhaust components with a freer-flowing performance exhaust arrangement.

Its main functions include:

  • Improves Exhaust Gas Flow: Uses a performance-oriented pipe layout to reduce unnecessary restrictions within the exhaust system.
  • Provides Driver-Controlled Exhaust Sound: Allows switching between two distinct sound characteristics.
  • Creates a Refined Closed-Valve Mode: Directs exhaust gases through the quad-resonated X-pipe for a smoother, more subdued exhaust note.
  • Delivers an Aggressive Open-Valve Mode: Bypasses the resonated section to produce a louder, more direct exhaust sound.
  • Enhances Turbocharged Flat-Six Character: Makes the distinctive exhaust note of the Porsche 3.8L twin-turbocharged engine more prominent.
  • Supports Performance Optimisation: Provides an exhaust configuration designed to improve flow and potentially enhance engine response.
  • Reduces Exhaust System Weight: Fabspeed lists an approximate 5 lb weight reduction compared with the corresponding factory arrangement.
  • Uses High-Flow Stainless Steel Pipework: Mandrel-bent tubing helps maintain consistent exhaust flow through pipe bends.
  • Provides Durable Valve Operation: Uses Helical vacuum-actuated valves designed for high-temperature service.
  • Enhances Rear Styling: Includes deluxe quad-style exhaust tips.
  • Supports Different Vehicle Configurations: Offers valve-control options for vehicles with or without factory Porsche Sport Exhaust.
  • Maintains Bolt-On Installation: Designed to fit the corresponding Porsche 991 Turbo application without cutting or welding.

Symptoms Of Wear Or Failure:
The Fabspeed Valved Supersport X-Pipe is primarily a performance upgrade rather than a component that must be replaced at a fixed service interval.

However, deterioration of the original exhaust system or faults within an existing valved exhaust assembly may make replacement or repair necessary.

  • Hissing, ticking or blowing noises.
  • Increased exhaust volume from an unexpected location.
  • Soot deposits around exhaust joints.
  • Exhaust fumes around the rear of the vehicle.
  • Increased noise during acceleration.
  • Visible rust or deterioration.
  • Weak or damaged welds.
  • Cracked mounting points.
  • Perforated pipework.
  • Exhaust sections becoming loose or insecure.
  • Exhaust sound remaining unchanged when switching modes.
  • One exhaust valve operating while the other remains stationary.
  • A valve stuck open, causing consistently high exhaust volume.
  • A valve stuck closed, preventing the louder operating mode.
  • Unusual metallic rattling around the valve assemblies.
  • Irregular valve movement.

Why Replacement / Upgrading Matters:
Upgrading to the Fabspeed Valved Supersport X-Pipe can improve the driving experience by combining performance-oriented exhaust flow with adjustable sound control.
  • Two Exhaust Sounds in One System: Switches between a more refined resonated mode and a louder performance mode.
  • Enhanced Exhaust Character: Brings out the distinctive sound of the Porsche 991 Turbo's twin-turbocharged flat-six engine.
  • Improved Exhaust Flow: Uses larger performance-oriented pipework and an optimised flow path.
  • Potential Performance Gains: Designed to support improved power delivery and throttle response, depending on vehicle configuration.
  • High-Quality Construction: T304L stainless steel provides excellent resistance to corrosion and heat-related deterioration.
  • Premium Helical Exhaust Valves: Provides a durable valve arrangement engineered for demanding operating conditions.
  • CNC Mandrel-Bent Tubing: Maintains a consistent internal diameter through bends to support smooth gas flow.
  • Reduced Exhaust Weight: Offers a lighter configuration than the corresponding original exhaust arrangement.
  • Customisable Appearance: Deluxe quad-style tips provide a choice of finishes.
  • Adaptable Control: Can be configured for vehicles equipped with factory PSE or an additional Fabspeed valve controller.
  • Direct Bolt-On Design: Avoids the need for permanent cutting or welding during installation.
  • Premium Performance Engineering: Developed specifically for the Porsche 991 Turbo and Turbo S platform.



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

FSPOR991TSSXXVQ
99111133105
99111133106
99111133107
99111133504
99111133505
99111133506
99111133507

The product you are viewing cross references to these numbers
FSPOR991TSPKGT
Product Information
Product Information
Fabspeed Supersport STREET Performance Exhaust Package.

The Fabspeed Supersport STREET Performance Package is a comprehensive performance upgrade designed for the 2013–2016 Porsche 991 Turbo and Turbo S.

Fits:

  • Porsche 991.1 Turbo 3.8L (520 Bhp) 2013-16
  • Porsche 991.1 Turbo S 3.8L (560 Bhp) 2013-16  

Rather than upgrading a single component, the package combines freer-flowing exhaust hardware, performance headers, improved intake filtration and ECU software to enhance the overall breathing and response of the twin-turbocharged 3.8-litre engine.

The package includes:

  • Fabspeed Supersport X-Pipe Exhaust System
  • 200-cell HJS Sport Catalytic Converters
  • Fabspeed Sport Headers
  • BMC F1 Replacement Air Filter
  • Fabspeed XperTune Performance Software with handheld tuner
  • Choice of Deluxe Quad-Style or GT2-Style exhaust tips

Fabspeed quotes gains of approximately 83 horsepower and 127 lb-ft of torque, together with a 15 lb reduction in weight. Actual results can vary depending on vehicle condition, fuel, specification and operating conditions.

What This Product Does:
The package improves several areas that affect engine airflow and turbocharger performance.

The factory intake and exhaust systems must balance refinement, noise control, emissions requirements and performance. The Fabspeed package uses less restrictive components and matching engine-management software to increase airflow and allow the engine to take greater advantage of the upgraded hardware.

Its main benefits include:

  • Improved exhaust gas flow
  • Reduced post-turbo exhaust restriction
  • Improved throttle response
  • Shorter turbo spool time
  • Quicker acceleration
  • Increased horsepower and torque
  • More pronounced sports-car exhaust sound
  • Reduced exhaust-system weight
  • Improved intake airflow
  • ECU calibration designed around the performance upgrades

Symptoms Of Wear Or Failure:
Because this package replaces or upgrades several systems, symptoms vary depending on the component affected.

  • Exhaust blowing, ticking or hissing
  • Cracked pipes or welds
  • Black soot around leaking joints
  • Metallic rattling from catalytic converters
  • Reduced engine performance
  • Increased turbo lag
  • Restricted exhaust flow
  • Check Engine Light relating to catalyst efficiency
  • Unusual sulphur-like exhaust smell
  • Corroded or damaged exhaust components

Why Replacement / Upgrading Matters:
The Porsche 991 Turbo relies on efficient airflow both before and after its turbochargers.

A restricted intake makes it harder for the engine to draw the air it needs, while excessive exhaust restriction works against efficient evacuation of gases after combustion.

Deteriorated catalysts, leaking headers or damaged exhaust components can therefore contribute to:

  • Slower turbo response
  • Reduced performance
  • Increased exhaust temperatures
  • Poor throttle response
  • Exhaust leaks
  • Increased mechanical and thermal stress

Replacing deteriorated components restores the integrity of these systems.

For a vehicle with healthy factory components, the Fabspeed package is primarily a performance upgrade, combining intake, exhaust and ECU modifications as one integrated system rather than upgrading each component independently.



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

FSPOR991TSPKGT
99111173170
99111173171
99111171271
99111171171

The product you are viewing cross references to these numbers
FSPOR991CMBXV
Product Information
Product Information
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
99104420004
99104420003

The product you are viewing cross references to these numbers
FSPOR991MAX
Product Information
Product Information
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
99111132201
99111132202
99111132203
99111142201
99111142202
99111142203
99111143705
99111143706
99111143707

The product you are viewing cross references to these numbers
FSPOR991SSX
Product Information
Product Information
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
99111133105
99111133106
99111133107
99111133504
99111133505
99111133506
99111133507
99111133701
99111133702
99111133703
99111132201
99111132202
99111132203
99111142201
99111142202
99111142203
99111143705
99111143706
99111143707

The product you are viewing cross references to these numbers
FSPOR991VES
Product Information
Product Information
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.

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About Fabspeed Exhaust

Fabspeed Exhaust Systems - Precision Performance & Sound Upgrades

Fabspeed Exhaust Systems are premium performance exhaust upgrades engineered to deliver increased power, improved exhaust flow, and a distinctive motorsport-inspired sound. Designed and manufactured with precision engineering and performance testing at their core, Fabspeed exhausts are built to enhance the driving experience of Porsche road and track vehicles alike.

Available from Design911, Porsche Fabspeed exhaust components are crafted using high-quality stainless steel and optimised designs to reduce backpressure, improve throttle response, and unleash a more engaging exhaust tone while maintaining durability and reliability.

What Do Fabspeed Exhaust Systems Do?

Fabspeed exhausts optimise exhaust gas flow and acoustic performance.

Core Functions:

  • Reduce exhaust restriction and backpressure.
  • Improve throttle response and power delivery.
  • Enhance exhaust sound and character.
  • Improve engine efficiency and breathing.
  • Upgrade exhaust aesthetics and build quality.

A high-flow exhaust system plays a key role in unlocking engine performance.

Why Do Standard Exhaust Systems Fail or Limit Performance?

Factory exhaust systems are designed to prioritise emissions compliance, cost efficiency, and sound suppression. Over time, they can suffer from:

  • Restrictive internal baffling reducing performance.
  • Corrosion from moisture and repeated heat cycles.
  • Excessive weight limiting efficiency.
  • Muted exhaust sound lacking engagement.
  • Reduced compatibility with performance tuning upgrades.

As engines are pushed harder, standard exhausts can become a performance bottleneck.

Why Upgrade to a Fabspeed Exhaust?

Fabspeed exhaust systems are designed for drivers seeking performance-focused enhancements.

Upgrade Benefits:

  • Improved exhaust flow for increased performance.
  • Sportier, more aggressive exhaust sound.
  • Lightweight, durable stainless steel construction.
  • Precision-engineered components for perfect fitment.
  • Ideal for performance road cars and track applications.

Upgrading to Fabspeed delivers noticeable gains in sound, response, and driving excitement.

Highlights

  • Porsche Fabspeed performance exhaust systems
  • Improved exhaust flow and throttle response
  • Sporty, motorsport-inspired exhaust sound
  • High-quality stainless steel construction
  • Designed for performance and enthusiast driving       

Fabspeed Exhaust

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