SOUL Valved Exhaust System. Porsche 981 GT4 / Boxster Spyder / Clubsport › POR.GT4.VES.

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.