Catalyst / Bypass

Exhaust heat shield for Silencer with catalyst

Fits:
Porsche 996 Turbo 2001-05

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Diagram ref no 19

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Related, superseded, cross reference or alternative numbers for comparison.

99611120

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Fabspeed Link Comp. Pipes.

The Fabspeed Porsche 996 Turbo Cat Bypass Pipes are high-performance exhaust components developed for the Porsche 911 Turbo (996), designed specifically for use with compatible existing Fabspeed exhaust systems.

Fits:

• Porsche 996 TURBO 2000-05

Manufactured from premium 14–16 gauge T304L stainless steel, these catalyst-bypass pipes replace the sport catalytic converter sections of the Fabspeed exhaust with straight-through pipework.

Their purpose is to provide a less restrictive exhaust path, producing a more aggressive exhaust note and supporting improved exhaust gas flow from the Porsche 996 Turbo's twin-turbocharged 3.6-litre flat-six engine.

By removing the catalytic converter elements from the exhaust path, the bypass pipes eliminate a source of exhaust restriction and create a more direct route for gases leaving the turbochargers.

Fabspeed designs these pipes for owners seeking a more extreme, motorsport-oriented exhaust configuration.

The system uses CNC mandrel-bent stainless steel tubing to provide smooth internal pipe geometry, consistent exhaust routing and durable construction.

Fabspeed describes the pipes as a direct bolt-on alternative to the corresponding catalytic converter sections in its compatible exhaust systems.

A key feature of this product is its modular compatibility with existing Fabspeed exhaust components, including suitable Maxflo and Supersport X-Pipe configurations.

However, these are not universal catalyst replacement pipes.

They do not fit directly onto the original Porsche factory exhaust or exhaust systems manufactured by other aftermarket suppliers.

Fabspeed lists a weight reduction of approximately 25 lb (11.3 kg), although the precise saving will depend on the configuration being replaced.

The manufacturer also states that the pipes can improve power delivery and throttle response, but does not publish a confirmed horsepower or torque increase for this standalone product.

What This Product Does:
The Fabspeed Cat Bypass Pipes replace the catalytic converter sections of a compatible Fabspeed Porsche 996 Turbo exhaust.

In a conventional catalytic exhaust, exhaust gases pass through a catalytic converter containing a coated internal substrate.

The converter treats pollutants in the exhaust gases, but its internal structure also creates a degree of flow resistance.

Fabspeed's bypass pipes replace those sections with straight-through tubing, eliminating the catalytic converter substrate from the exhaust path.

The main functions and benefits include:

• Creates a Straight-Through Exhaust Route: Replaces the existing Fabspeed sport catalytic converter sections with unrestricted pipework.
• Reduces Exhaust Restriction: Removes the catalytic substrate from the exhaust gas path.
• Supports Increased Exhaust Flow: Provides a less restrictive route for gases leaving the turbochargers.
• Enhances Motorsport Exhaust Sound: Produces a louder, sharper and more aggressive exhaust character.
• Improves Performance Potential: Designed to support stronger power delivery in suitable performance configurations.
• Supports Throttle Responsiveness: Fabspeed advertises improved throttle response.
• Reduces Exhaust System Weight: Fabspeed lists a weight reduction of approximately 25 lb.
• Uses Corrosion-Resistant Stainless Steel: T304L construction offers durability under high exhaust temperatures.
• Maintains Smooth Pipe Geometry: CNC mandrel bending helps preserve consistent internal tubing dimensions.
• Integrates with Compatible Fabspeed Systems: Designed for selected existing Maxflo and Supersport X-Pipe exhaust configurations.
• Supports Motorsport Preparation: Provides a catalyst-free configuration for vehicles used in permitted competition or closed-course environments.
• Allows Modular Exhaust Configuration: Enables compatible Fabspeed exhaust systems to use either the appropriate catalytic converter sections or the bypass configuration.

Symptoms Of Wear Or Failure:
The Fabspeed Cat Bypass Pipes are primarily a motorsport performance modification, not a standard maintenance replacement.

However, owners may be considering them while inspecting deteriorated exhaust components or preparing a dedicated track vehicle.

1. Corroded Exhaust Pipework

Exposure to moisture, heat and environmental contamination can cause corrosion around exhaust pipes, joints and flanges.

Advanced corrosion may weaken the affected sections and lead to leakage.

2. Cracked Exhaust Welds

Repeated heating and cooling, vibration or mechanical stress can contribute to cracks around welded joints.

Possible signs include exhaust blowing noises and visible soot deposits.

3. Exhaust Leaks

Damaged flanges, failed gaskets or cracked pipework can allow exhaust gases to escape before reaching the tailpipes.

Exhaust leaks may create hissing, blowing or ticking sounds.

4. Restricted Catalytic Converters

A damaged or internally deteriorated catalyst may become partially blocked.

A significant restriction can increase exhaust backpressure and reduce engine performance.

5. Loose Catalytic Converter Substrate

Damage within a catalytic converter may cause internal rattling or metallic vibration.

These noises can sometimes change with engine speed or load.

6. Reduced Engine Performance

Excessive exhaust restriction may contribute to reduced power or sluggish acceleration.

However, poor performance can also be caused by ignition faults, boost leaks, faulty sensors or turbocharger problems.

7. Unusual Exhaust Temperatures

Severe restrictions or engine combustion faults may contribute to abnormal exhaust temperatures.

The cause should be diagnosed before any performance modification is made.

8. Damaged Exhaust Flanges

Corroded or distorted flanges may prevent exhaust sections from sealing correctly.

9. Deteriorated Mounting Hardware

Loose or damaged exhaust fasteners can cause movement, rattling and leaks.

10. Unwanted Exhaust Vibration

Poor alignment, damaged supports or cracked components may produce vibration or metallic contact with the surrounding bodywork.

11. Exhaust-Related Diagnostic Faults

Catalytic converter efficiency faults or exhaust sensor problems may trigger an engine warning light.

The underlying cause requires proper diagnosis rather than simply removing the converter.

12. Visible Impact Damage

Exhaust pipes or catalytic converter housings may be damaged by road debris, contact with obstacles or incorrect lifting procedures.

Why Replacement / Upgrading Matters:

• The exhaust system is an important part of the Porsche 996 Turbo's engine operation.
• Exhaust gases drive the turbochargers before passing through the downstream exhaust components.
• The design of the exhaust system can influence gas flow, pressure and the sound characteristics of the vehicle.
• For a dedicated competition or closed-track Porsche 996 Turbo, Fabspeed Cat Bypass Pipes provide a way to configure an existing Fabspeed exhaust for reduced downstream restriction.

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
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FSPOR996TCB

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Fabspeed Muffler Bypass Pipes.

The Fabspeed Muffler Bypass Pipes are a performance-focused exhaust upgrade designed for compatible Porsche 996 Turbo, X50 and GT2 applications.

Fits:

• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05  

These straight-through pipes replace the Fabspeed Maxflo rear mufflers, creating a much more direct exhaust path from the Fabspeed Sport Catalytic Converters to the exhaust tips. Removing the mufflers substantially increases exhaust volume and gives the 996 Turbo a raw, aggressive motorsport-inspired sound.

The system also removes a considerable amount of rear exhaust weight. Fabspeed states that this configuration saves approximately 50 lb compared with the standard 996 Turbo exhaust system.

These bypass pipes are specifically designed as part of the Fabspeed modular exhaust system. Existing Fabspeed Sport Catalytic Converters are required, and the pipes will not directly fit the original Porsche exhaust or other aftermarket 996 Turbo systems.

What This Product Does:
A conventional rear muffler reduces exhaust noise by forcing exhaust gases through internal chambers, perforated tubes or sound-absorbing structures.

The Fabspeed Muffler Bypass Pipes eliminate the rear mufflers and provide a much more direct path for exhaust gases to travel towards the tailpipes.

Their primary functions and benefits include:

• Eliminating the Fabspeed Maxflo rear mufflers
• Creating a freer and more direct exhaust route
• Producing a considerably louder and more aggressive exhaust note
• Reducing rear exhaust system weight
• Allowing reuse of compatible factory, aftermarket or Fabspeed exhaust tips
• Providing a motorsport-inspired exhaust character
• Allowing compatible Fabspeed systems to be converted between muffled and bypass configurations

Fabspeed specifically designed the system to be interchangeable, allowing owners with the required Fabspeed components to change between a muffler and muffler-bypass arrangement.

Symptoms Of Wear Or Failure:
Exhaust bypass pipes contain fewer internal components than conventional mufflers, but they are still exposed to extreme heat, vibration, moisture and road contamination.

Signs that the bypass pipes or their connections may require attention include:

• Cracks around welds or pipe joints
• Exhaust blowing or hissing sounds
• Black soot around leaking connections
• Loose clamps or mounting hardware
• Excessive movement or vibration
• Metallic rattling from loose mounting points
• Visible corrosion or surface deterioration
• Dents or impact damage to the pipework
• Exhaust tips becoming incorrectly aligned
• Exhaust fumes escaping from joints before the tailpipes
• Unusual changes in exhaust sound
• Pipes contacting surrounding bodywork or heat shields

If the vehicle is still fitted with its original mufflers, deterioration may instead appear as rattling internal components, corrosion, cracking, exhaust leaks or damage to the muffler casing.

Why Replacement / Upgrading Matters:

• A damaged exhaust pipe or leaking connection can allow hot exhaust gases to escape before reaching the intended outlets. This can create unwanted noise, soot deposits and additional heat around nearby components.
• Cracked or poorly supported exhaust components can also move excessively and place additional load on mounting brackets, joints and surrounding parts.
• Where the existing Fabspeed Maxflo system is in good condition, fitting the Muffler Bypass Pipes is primarily a performance-sound and weight-reduction upgrade rather than a necessary repair. The bypass configuration removes the rear mufflers and gives the 996 Turbo a significantly more aggressive exhaust character.
• For owners using their vehicle for performance driving or seeking a more dramatic exhaust note, the reduced restriction and considerable weight saving can make the bypass configuration particularly attractive.
• If replacing worn or damaged exhaust components, restoring secure, correctly aligned pipework also ensures that exhaust gases are directed safely to the rear of the vehicle.

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FSPOR996TMB

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Lambda Sensor Blanking Plug and Receiver Socket Set.
In case you need to relocate your existing lambda probe because it's not in the right location. Welding and cutting specialist required.

Fits:
Many Porsche vehicles. Universal kit.

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100390100392

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