SOUL Race Exhaust System. Porsche 981 GT4 / Boxster Spyder › POR.GT4M.RER.

9m 981 Titanium valved silencer

• Constructed from Aerospace grade TC4 titanium precision welded with a lifetime guarantee 
• Weighing in at 9kg in total with a weight saving of 7kg over the stock silencer(16kg) 
• Direct bolt on installation 
• Fits original exhaust tips or optional 9m 981 GT4RS titanium style X pipe tips
• Exhaust Valve Controller Supplied in Kit

The SOUL Performance Valved Exhaust System is a high-quality aftermarket exhaust upgrade developed specifically for the Porsche 981 Cayman GT4, Boxster Spyder and GT4 Clubsport models manufactured between 2015 and 2016.

Fits:

• Porsche Boxster 981 Spyder 3.8L 2016
• Porsche Cayman GT4 3.8L 2015-16  

The Porsche 981 GT4 and Boxster Spyder are renowned for their distinctive engine character, high-revving performance and engaging driving experience.

SOUL Performance has engineered this exhaust system to enhance those qualities while maintaining the flexibility required for both everyday driving and more enthusiastic use.

Unlike a permanently loud aftermarket exhaust, the SOUL Valved Exhaust System provides two selectable sound characteristics.

With the exhaust valves closed, gases are directed through the integrated SOUL mufflers, which contain high-quality sound-absorbing material.

This arrangement produces a deeper, refined exhaust tone while minimising unwanted cabin drone during steady motorway driving.

With the exhaust valves open, the exhaust gases can flow through a more direct 2.5-inch exhaust path, producing a louder, more aggressive exhaust note.

The open-valve arrangement highlights the characteristic sound of the Porsche flat-six engine, particularly during acceleration, high-RPM operation and downshifts.

Manufactured from mandrel-bent T304L stainless steel, the system is designed to provide durability, corrosion resistance and consistent exhaust flow.

The over-axle pipes feature a 2.5-inch outside diameter, while the reinforced muffler casings are designed to withstand repeated heating and cooling cycles.

The system also incorporates carefully positioned perforations that allow exhaust pulses to interact with the mufflers even when the valves are open, encouraging a fuller and more rounded exhaust tone.

A selection of exhaust tip styles and finishes allows owners to customise the rear appearance of their Porsche.

Available manufacturer options include 321 stainless steel exhaust tips and lightweight single-wall titanium tips.

The system is designed to work with the Porsche factory exhaust valve controls, allowing the driver to retain familiar operation through the original exhaust button.

SOUL also identifies compatibility with its optional remote valve controllers and HomeLink-based control arrangements.

Each exhaust system is fixture-tested before dispatch and supplied with installation instructions for a direct bolt-on installation on compatible vehicles.

Backed by SOUL Performance's lifetime warranty, subject to the manufacturer's terms, this valved exhaust is an attractive upgrade for owners looking to improve the sound, character and appearance of their Porsche without permanently sacrificing cruising refinement.

What This Product Does:
The SOUL Performance Valved Exhaust System manages the flow of exhaust gases through the rear exhaust assembly while allowing the driver to select between two distinct exhaust sound characteristics.

Exhaust gases leave the engine through the exhaust manifolds and catalytic converter assemblies before travelling through the rear exhaust system.

The SOUL system receives these gases through its over-axle pipes and directs them towards the exhaust outlets.

The electronically operated exhaust valves determine whether the gases pass predominantly through the sound-absorbing mufflers or follow the more direct exhaust path.

Its primary functions include:

• Directing exhaust gases: Carries spent gases from the upstream exhaust components towards the rear outlets.
• Providing selectable exhaust sound: Allows quieter and louder operating modes.
• Reducing motorway drone: Uses dedicated muffler construction to minimise unwanted low-frequency resonance.
• Enhancing engine sound: Produces a deeper and more pronounced naturally aspirated flat-six soundtrack.
• Supporting efficient exhaust flow: Uses mandrel-bent tubing and a more direct flow path with the valves open.
• Maintaining driver control: Integrates with the factory exhaust valve control system.
• Supporting everyday comfort: Offers a more restrained exhaust character with the valves closed.
• Enhancing spirited driving: Provides a stronger exhaust note during acceleration and downshifts.
• Improving rear-end appearance: Incorporates a choice of premium exhaust tip styles and finishes.
• Providing durable construction: Uses stainless steel components designed for demanding exhaust temperatures.
• Supporting compatible performance upgrades: Can be paired with appropriate factory or aftermarket header configurations.
• Maintaining a factory-style installation: Uses mounting and connection arrangements intended for compatible vehicles.

When the valves are closed, exhaust gases are directed through the SOUL mufflers.

The mufflers contain durable sound-absorbing material designed to reduce unwanted resonance while maintaining a sporting exhaust note.

This setting is intended for normal road driving, longer journeys and situations where a more restrained exhaust sound is preferred.

Benefits include:

• A deeper but more controlled exhaust note.
• Reduced low-frequency cabin resonance.
• Improved cruising refinement compared with an unrestricted exhaust.
• A sporting sound without permanently operating at maximum volume.
• Convenient operation using the existing exhaust controls.

SOUL states that its system is designed to avoid unwanted motorway drone when paired with factory headers or appropriate high-flow catted headers.

Valves Open – Enhanced Performance Sound

With the valves open, exhaust gases can travel through the larger, more direct 2.5-inch piping.

This reduces the amount of sound attenuation compared with the closed-valve arrangement.

The result is a stronger exhaust sound that becomes particularly noticeable during acceleration and higher engine speeds.

Benefits include:

• A louder and more aggressive flat-six exhaust note.
• Greater exhaust character during acceleration.
• A more pronounced sound during downshifts.
• A fuller tone from the specially designed muffler and pipe arrangement.
• A more engaging driving experience.       

It combines performance-oriented construction with the convenience of selectable exhaust sound.

1. Enhanced Flat-Six Sound

• The 3.8L naturally aspirated engine fitted to the Porsche 981 GT4 and Boxster Spyder produces a distinctive high-revving exhaust note.
• The SOUL system is designed to amplify and refine this sound, producing a deeper tone with the valves closed and a more aggressive character with the valves open.

2. Selectable Exhaust Volume

• The electronic valve arrangement allows the driver to choose between two different exhaust modes.
• This makes the system suitable for owners who want a more pronounced sound during spirited driving but prefer a quieter exhaust on longer journeys.

3. Reduced Unwanted Drone

• The SOUL mufflers use sound-absorbing materials and a carefully developed internal design to minimise unwanted resonance.
• This is particularly valuable during steady motorway driving, where permanently loud exhaust systems can become tiring.

4. Improved Exhaust Flow Potential

• The system uses mandrel-bent stainless steel tubing and a more direct exhaust path when the valves are open.
• This arrangement is designed to support efficient exhaust gas movement.
• It may complement other performance upgrades, but specific horsepower and torque gains have not been verified for this exhaust system alone.

5. Factory Exhaust Valve Control Compatibility

• The system is compatible with the original Porsche exhaust valve controls.
• Drivers can retain the familiar exhaust control operation rather than relying on a completely separate system.
• Optional SOUL valve-control solutions may offer additional operating flexibility.

6. Durable Stainless Steel Construction

• The T304L stainless steel exhaust tubing and reinforced muffler casings are designed to withstand high temperatures, vibration and repeated thermal cycles.
• The use of corrosion-resistant materials makes the system suitable for long-term enthusiast use.

7. Premium Exhaust Tip Options

• A choice of stainless steel and titanium exhaust tips allows owners to customise the vehicle's rear appearance.
• Titanium single-wall tips offer a lightweight alternative to stainless steel.

8. Direct Bolt-On Installation

• The system is designed as a direct replacement for the compatible factory rear exhaust.
• SOUL fixture-tests its exhaust assemblies and supplies installation instructions.

9. Retention of the Upstream Exhaust System

• This is a rear exhaust upgrade rather than a complete exhaust manifold and catalytic converter replacement.
• Compatible original headers and catalytic converters can remain installed.

10. Manufacturer's Lifetime Warranty

• SOUL Performance backs the system with its lifetime warranty for street and track use, subject to the published warranty conditions.

The SOUL Performance Exhaust System is a high-quality aftermarket sports exhaust upgrade designed specifically for the Porsche 981 Cayman GT4, Boxster Spyder and GT4 Clubsport models manufactured between 2015 and 2016.

Fits:

• Porsche Boxster 981 Spyder 3.8L 2016
• Porsche Cayman GT4 3.8L 2015-16  

Developed for the naturally aspirated 3.8-litre flat-six engine, this performance exhaust system replaces the original rear exhaust assembly with a lightweight, non-valved stainless steel design incorporating performance silencers and a choice of premium exhaust tips.

The Porsche 981 GT4 and Boxster Spyder are renowned for their responsive engines, distinctive high-revving exhaust character and engaging driving experience.

SOUL Performance has engineered this exhaust system to enhance those characteristics by providing a more direct exhaust flow arrangement and a stronger, more pronounced engine sound.

Unlike a conventional valved sports exhaust, the SOUL Performance Exhaust System does not incorporate electronically operated exhaust valves.

Instead, it provides a consistent sporting exhaust note whenever the engine is running.

SOUL describes the system's sound as similar in character to its Valved Exhaust System with the valves open, but with carefully developed mufflers to minimise undesirable drone and rasp.

The exhaust is designed to produce a deeper and fuller tone than the factory Porsche Sport Exhaust (PSE), with the manufacturer describing its volume as greater than PSE in the open-valve setting.

However, the system is not intended to produce an unnecessarily harsh or excessively resonant sound during normal driving.

Its performance silencers contain high-quality sound-absorbing material designed to withstand repeated heating and cooling cycles without prematurely deteriorating.

The reinforced muffler casings are engineered for durability under demanding operating conditions.

Manufactured from mandrel-bent T304L stainless steel, the system incorporates 2.5-inch outside-diameter over-axle pipes to provide a smooth exhaust gas path.

Mandrel bending helps maintain a consistent internal pipe profile through bends, reducing unnecessary restrictions compared with poorly formed exhaust tubing.

The system is also designed to be lighter than the equivalent SOUL valved exhaust arrangement by eliminating the exhaust valve mechanisms.

A range of exhaust tip styles and finishes allows owners to personalise the rear appearance of their Porsche.

Available options include single-wall and double-wall stainless steel tips, alongside lightweight titanium single-wall exhaust tips.

SOUL states that its titanium single-wall tips can save nearly one pound compared with the corresponding stainless steel tips.

Each exhaust assembly is quality-checked and tested in a dedicated fitting fixture before dispatch.

The system is designed for direct bolt-on installation on compatible vehicles, with manufacturer-supplied fitting instructions.

Backed by SOUL Performance's lifetime warranty, subject to the published conditions, this performance exhaust is suitable for owners seeking a more distinctive flat-six soundtrack, durable stainless steel construction and a simpler non-valved rear exhaust arrangement.

It is particularly attractive for Porsche enthusiasts who prefer a consistently sporting exhaust tone without relying on selectable valve operation.

What This Product Does:
The SOUL Performance Exhaust System carries exhaust gases from the engine's upstream exhaust components through the rear exhaust assembly and releases them through the exhaust outlets.

During engine operation, combustion gases leave the cylinder heads and travel through the exhaust manifolds and catalytic converter assemblies.

These gases then enter the rear exhaust system.

The SOUL exhaust uses mandrel-bent stainless steel tubing and specially developed silencers to direct the exhaust gases towards the rear outlets while controlling the resulting sound.

Its main functions include:

• Directing exhaust gases: Carries spent combustion gases through the rear exhaust and safely towards the outlets.
• Supporting efficient exhaust flow: Uses 2.5-inch over-axle tubing with smooth mandrel-formed bends.
• Enhancing exhaust sound: Produces a fuller, deeper and more aggressive naturally aspirated flat-six soundtrack.
• Reducing unwanted drone: Incorporates performance silencers designed to minimise low-frequency cabin resonance.
• Controlling exhaust rasp: Uses sound-absorbing mufflers to help maintain a refined exhaust character.
• Providing consistent sound: Delivers its sporting exhaust note without selectable exhaust valves.
• Supporting responsive engine behaviour: Provides a performance-oriented rear exhaust arrangement intended to complement the 3.8L engine.
• Maintaining upstream components: Retains compatible existing exhaust manifolds and catalytic converters.
• Improving rear appearance: Offers different exhaust tip designs and finishes.
• Providing durability: Uses corrosion-resistant stainless steel tubing and reinforced muffler casings.
• Reducing mechanical complexity: Eliminates the valve mechanisms found in a valved rear exhaust.
• Supporting performance modifications: Can complement compatible aftermarket exhaust headers and other appropriate upgrades.

The SOUL Performance Exhaust System is designed to provide a stronger exhaust sound while retaining a level of refinement suitable for enthusiast use.

The manufacturer describes the system as producing a sound similar to the open-valve setting of its Valved Exhaust System.

The sound is intended to be greater in volume than the factory Porsche Sport Exhaust with its valves open.

Depending on the complete exhaust configuration, drivers may notice:

• A deeper exhaust tone at idle.
• A fuller and more robust flat-six soundtrack.
• A more pronounced exhaust note during acceleration.
• Greater sound intensity at higher engine speeds.
• Enhanced exhaust character during downshifts.
• A distinctive sporting tone during normal driving.
• Reduced unwanted drone compared with a completely unrestricted rear exhaust.
• A more refined character than a dedicated straight-through race exhaust.

1. Enhanced Flat-Six Exhaust Sound

The naturally aspirated 3.8L engine fitted to the Porsche 981 GT4 and Boxster Spyder produces a distinctive high-revving soundtrack.

SOUL's performance exhaust is designed to emphasise this character, creating a deeper and more aggressive exhaust tone.

2. Consistent Sporting Sound

Unlike a valved exhaust, this system does not switch between quiet and loud modes.

It provides a consistent performance exhaust character during everyday driving and more enthusiastic use.

This appeals to drivers who prefer a fixed exhaust sound.

3. Reduced Mechanical Complexity

The non-valved design eliminates moving exhaust valves and their associated mechanisms from the replacement rear exhaust.

This can simplify the exhaust arrangement compared with a system that requires valve actuation.

However, vehicle-side valve-control components may remain and should be managed according to the manufacturer's installation guidance.

4. Improved Exhaust Flow Potential

The system uses mandrel-bent 2.5-inch over-axle piping.

This design is intended to support efficient exhaust gas movement through the rear exhaust.

Specific horsepower or torque gains for this exhaust alone have not been independently confirmed.

5. Reduced Unwanted Drone

The SOUL mufflers use durable sound-absorbing materials to help control low-frequency resonance.

This makes the system an alternative to completely unrestricted rear exhaust designs.

6. Durable Stainless Steel Construction

T304L stainless steel provides corrosion resistance and suitability for repeated exposure to exhaust heat and vibration.

The reinforced muffler casings are designed for long-term durability.

7. Lighter Non-Valved Design

SOUL developed this exhaust as a lighter alternative to its valved system.

Eliminating exhaust valve hardware reduces the number of components within the rear assembly.

The exact complete-system weight saving should be verified before quoting a numerical figure.

8. Premium Exhaust Tip Options

Owners can choose from a range of single-wall and double-wall exhaust tips.

Lightweight titanium tips are available as an alternative to stainless steel.

This allows the rear appearance of the vehicle to be personalised.

9. Direct Bolt-On Installation

The exhaust is designed for direct installation on compatible vehicles.

SOUL Performance checks each system in an installation fixture and supplies fitting instructions.

10. Compatibility with Performance Headers

The manufacturer developed this exhaust to provide a sporting sound when combined with appropriate aftermarket exhaust headers.

Its mufflers help control unwanted resonance that may otherwise become more pronounced with freer-flowing upstream exhaust components.

11. Suitable for Enthusiast and Track Applications

The system provides an aggressive soundtrack while incorporating effective sound attenuation.

This may appeal to track users who require improved exhaust flow but also need to consider circuit noise limits.

Actual decibel readings must be measured for the complete vehicle configuration.

12. Manufacturer Lifetime Warranty

SOUL Performance backs its exhaust components with a lifetime warranty for street and track use, subject to the published terms and conditions.