Sport Silencers / Mufflers

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 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.

The SOUL Performance Race Exhaust System is a premium aftermarket motorsport exhaust developed specifically for the Porsche 981 Cayman GT4 and Boxster Spyder models manufactured between 2015 and 2016.

Fits:

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

Designed for the naturally aspirated 3.8-litre flat-six engine, this exhaust replaces the original rear exhaust assembly with a lightweight, high-flow stainless steel system engineered for demanding circuit driving and motorsport applications.

Unlike conventional sports exhaust systems, which balance performance, refinement and everyday comfort, the SOUL Race Exhaust is developed primarily to deliver maximum durability, reduced weight, efficient exhaust flow and a highly aggressive engine soundtrack.

The system uses 2.5-inch diameter T304L stainless steel tubing, manufactured with precision mandrel bends to maintain a consistent flow path through the exhaust system.

The tubing has a 0.065-inch wall thickness, providing a balance of strength, durability and lightweight construction.

Each system is manufactured in-house at SOUL Performance's Willow Grove, Pennsylvania facility, where the components are carefully fabricated and inspected.

The stainless steel brackets are laser-cut, press-brake formed and TIG-welded for strength, while the exhaust welds are back-purged to support long-term durability under demanding conditions.

One of the system's most distinctive features is its specially developed mounting arrangement.

Instead of relying exclusively on conventional exhaust hangers welded directly to the pipework, SOUL uses a bespoke transmission mounting brace, heavy-duty Mikalor band clamps and additional rubber vibration dampeners.

This construction is designed to reduce stress caused by engine movement, exhaust vibration and repeated thermal expansion.

SOUL states that its mounting arrangement saves over 5 lb (approximately 2.3 kg) compared with the original factory exhaust mounts.

The over-axle pipe geometry is also designed to provide sufficient clearance around the rear axles and anti-roll bar drop links, including on vehicles with lowered or modified suspension.

This is particularly relevant to track-prepared Porsche GT4 models, where aftermarket suspension setups may reduce available exhaust clearance.

The system is compatible with the original factory headers and SOUL Performance headers.

Compatibility with exhaust headers produced by other manufacturers must be checked carefully because dimensional differences may affect over-axle pipe clearance.

The SOUL Race Exhaust produces an exceptionally loud and aggressive exhaust note, emphasising the distinctive character of the Porsche naturally aspirated flat-six engine.

Its reduced sound attenuation produces a much more direct exhaust experience than the manufacturer's Performance Exhaust or Valved Exhaust systems.

SOUL explicitly states that exhaust drone will be present, even when resonators are used.

For this reason, the Race Exhaust is best suited to dedicated circuit cars, competition vehicles and other legally permitted off-road applications rather than everyday road use.

The exhaust is designed for direct bolt-on installation on compatible vehicles and includes new high-grade hardware for the header-to-exhaust flange connections.

Each assembly undergoes quality checks and fixture testing before dispatch.

Backed by SOUL Performance's lifetime warranty, subject to the manufacturer's terms, the Race Exhaust System provides a purpose-built solution for Porsche enthusiasts seeking reduced mounting weight, motorsport durability and an exceptionally aggressive flat-six soundtrack.

What This Product Does:
The SOUL Race Exhaust System directs spent combustion gases away from the engine's upstream exhaust components and through the rear exhaust outlets.

After combustion, exhaust gases leave the engine through the exhaust manifolds and associated catalytic converter assemblies, where fitted.

The gases then pass through the over-axle exhaust pipes and towards the rear outlets.

The SOUL Race Exhaust provides a performance-focused alternative to the original rear silencer arrangement.

Its main functions include:

• Directing exhaust gases: Carries combustion gases from the upstream exhaust system towards the rear outlets.
• Supporting efficient exhaust flow: Uses mandrel-bent stainless steel tubing with a 2.5-inch diameter.
• Reducing unnecessary restriction: Employs a race-focused flow path rather than a heavily silenced factory-style rear exhaust.
• Enhancing engine sound: Produces a substantially louder and more aggressive naturally aspirated flat-six soundtrack.
• Reducing mounting weight: Uses a bespoke mounting system that saves over 5 lb compared with the factory mounts.
• Supporting motorsport durability: Incorporates reinforced mounting components developed for demanding circuit operation.
• Reducing mounting stress: Uses heavy-duty clamps and rubber vibration dampeners to manage vibration and movement.
• Maintaining suspension clearance: Features over-axle pipework shaped to clear the axles and anti-roll bar drop links.
• Accommodating modified suspension: Provides pipe profiles developed with lowered and track-prepared vehicles in mind.
• Supporting repairability: Uses mounting components designed to be serviced or replaced after motorsport incidents.
• Providing corrosion resistance: Uses T304L stainless steel for repeated exposure to heat and environmental conditions.
• Maintaining compatible header connections: Connects to the original Porsche or suitable SOUL Performance exhaust headers.

It provides a much less attenuated soundtrack than the original Porsche rear exhaust.

Depending on the engine speed, upstream exhaust configuration and driving conditions, drivers may notice:

• A noticeably louder exhaust tone at idle.
• A very aggressive exhaust note during acceleration.
• Increased flat-six sound intensity at higher engine speeds.
• Stronger exhaust presence during gear changes and downshifts.
• Pronounced exhaust character during high-load circuit driving.
• Increased cabin resonance.
• Noticeable low-frequency exhaust drone.
• A more direct motorsport-style exhaust soundtrack.

The Race Exhaust is designed specifically for demanding track applications.

Its reinforced components and specialised mounting arrangement are intended to withstand the stresses associated with aggressive circuit driving.

2. Reduced Exhaust Restriction

The system uses mandrel-bent 2.5-inch exhaust tubing and a freer-flowing rear exhaust arrangement.

This supports efficient movement of exhaust gases through the system.

However, specific horsepower or torque gains for this exhaust alone have not been independently confirmed.

3. Reduced Mounting Weight

SOUL states that its bespoke mounting arrangement saves more than 5 lb compared with the original factory mounts.

This contributes to the weight-saving design of the system.

4. Improved Exhaust Support

Heavy-duty Mikalor clamps and additional rubber vibration dampeners are designed to reduce excessive stress on the pipework.

This can be particularly valuable in vehicles subjected to repeated high-load driving and vibration.

5. Improved Clearance for Lowered Vehicles

The over-axle pipe geometry is developed to provide clearance around the rear axles and anti-roll bar drop links.

This makes the system relevant to GT4 models fitted with modified or lowered suspension.

Final clearance must still be checked during installation.

6. Highly Aggressive Flat-Six Sound

The system is designed to deliver a strong, intense and unmistakably motorsport-inspired exhaust note.

It is suitable for drivers who prioritise exhaust character over quiet cruising.

7. Durable Stainless Steel Construction

The T304L stainless steel tubing offers corrosion resistance and durability under repeated thermal cycling.

The system also incorporates high-quality TIG welding and back-purged weld construction.

8. Improved Repairability

The specialised mounting components are designed to be more straightforward to repair or replace after a track incident than conventional fixed hanger arrangements.

9. Compatibility with Factory or SOUL Headers

The system is designed to connect to the factory headers or SOUL Performance headers.

Compatibility with other aftermarket header systems should not be assumed.

10. Direct Bolt-On Installation

SOUL Performance fixture-tests the exhaust assemblies for fitment and includes installation instructions.

New high-grade hardware is supplied for the header-to-exhaust flanges.

11. Manufacturer Lifetime Warranty

SOUL Performance provides a lifetime warranty for its exhaust components, subject to the applicable conditions.

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.