SOUL Performance Products

Porsche 981 Boxster / 981C Cayman  SOUL Street Exhaust Package

Experience the perfect balance of refinement and excitement with the SOUL Street Package for Porsche 981 Boxster and Cayman models. This system pairs SOUL Valved Exhaust with Long Tube Street Headers, delivering noticeable power gains, sharper throttle response, and a soundtrack that adapts to your driving mood—all without triggering a check engine light. With valves closed, the system offers a smooth, drone-free tone ideal for daily driving. Open the valves, and the flat-six unleashes its full roar through a straight-through flow path, exiting via exhaust tips in the style and finish of your choice. Built around large-diameter runners and high-flow catalytic converters, the headers maximize flow while enhancing that signature Porsche sound. Every system is backed by our industry-leading Lifetime Warranty, giving you confidence both on the street and at the track.

Package Includes:
•   SOUL Performance Products 981 Cayman Valved Exhaust System
•   SOUL Performance Products 981 Cayman Long Tube Street Headers

•   Fits all Porsche 981 Boxster / Cayman models (2013–2016)
•   Increased performance and sound with no check engine light
•   Direct bolt-on installation with included instructions
•   Multiple tip styles and finishes available – custom options too
•   Covered by SOUL’s Lifetime Warranty for street and track use

DEVELOPMENT:
For the 981 platform, we engineered a system with properly sized 2” runners and optimized collectors to unlock maximum power from the 3.4L engine, while still delivering impressive gains on the 2.7L. We selected high-flow catalytic converters sized for both performance and durability—avoiding the compromises of smaller, cheaper alternatives. The result is a superior exhaust that delivers a broad spectrum of sound: valves open reveal a CUP car–inspired roar, while valves closed provide a refined, drone-free tone. Thanks to SOUL mufflers, even with aftermarket headers the exhaust remains composed and reserved when the valves are shut.

CONSTRUCTION:
Our headers are precision-engineered and crafted from T304L stainless steel for strength and performance. Featuring port-matched flanges, smooth-radius primary tubing, and optimized collectors, they deliver maximum exhaust flow and power gains. Each system is mandrel-bent, fitted with reinforced muffler casings for durability, and rigorously quality-checked before shipping to ensure the highest standards.
  
TIPS:
Choose from several different tip styles and finishes – from single wall 321 stainless tips to double wall chrome tips. Logo customization and custom tip colours are available by request. Titanium single wall tips are also available and save nearly a pound of weight over stainless steel tips!

BOLT ON AND GO:
Each exhaust is rigorously quality-checked, tested in a fixture to guarantee fitment, and then foam packed to ensure it arrives in perfect condition. Thorough installation instructions are included in the box for a straightforward install that can be performed by most DIY enthusiasts.

LIFETIME WARRANTY:
Enjoy your SOUL exhaust components with confidence on both the street and track as they are covered by our Lifetime Warranty! Our team will quickly work with you to resolve any issues or answer any questions that you may have.

Please note: This item is not a stock product. It is a special order part and once ordered with us is not subject to cancellation or return unless proven not fit for purpose or defected.

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

POR.981.STPKG

The product you are viewing cross references to these numbers

Porsche 981 Boxster / 981C Cayman SOUL Valved Exhaust System

The factory exhaust system on the Porsche 981 Cayman and Boxster is bulky and restrictive, muting both performance and sound. The SOUL Valved Exhaust System is designed to free the car’s natural character by reducing weight and incorporating a precision valve system that delivers a dramatic transformation in responsiveness, tone, and driving enjoyment.
With the valves closed, the system produces a refined, sporty exhaust note with zero drone—perfect for comfortable daily driving and discreet neighborhood entries. Open the valves, and the flat-six engine comes alive with an intoxicating motorsport-inspired soundtrack, ideal for spirited back-road drives or track sessions.

•   Fits all Porsche 981 Boxster / Cayman models (2013–2016)
•   Direct bolt-on installation with included instructions
•   Choice of multiple exhaust tip styles and finishes—or customize your own

•    Valve controller kit included – necessary for cars without PSE and optional for cars with PSE to provide manual valve override
•   Covered by SOUL’s Lifetime Warranty for street and track use

DEWELOPMENT:
We wanted to be certain that our system offered a superior spectrum of sound – Cup car inspired with valves open but with a refined, no droning tone with valves closed. The SOUL mufflers practically eliminate droning – even with aftermarket headers the sound is reserved in the cabin with valves closed!

CONSTRUCTION:
Each system is constructed from mandrel-bent T304L stainless steel tubing, featuring 2.5″ over-axle pipes, and equipped with mufflers built with reinforced casings for long-term durability.
•  With the valves closed, exhaust gases are directed through SOUL’s high-quality mufflers, packed with premium sound-absorbing material engineered to withstand heavy use without breaking down. These mufflers are highly effective at eliminating drone, channeling gases through perforations into the outer piping for a smooth, refined tone.
•  Open the valves, and exhaust gases flow freely through the large 2.5″ straight-through piping, while the perforations allow the exhaust to interact with the muffler—producing a deeper, fuller, and more aggressive sound that captures the true character of the flat-six engine.

TIPS:
Choose from a variety of tip styles and finishes, ranging from sleek single-wall 321 stainless steel to premium double-wall chrome. For a personalized touch, logo engraving and custom tip colors are available upon request. For those seeking performance benefits, lightweight titanium single-wall tips are also offered—shedding nearly a pound compared to stainless steel options.

BOLT ON AND GO:
Each exhaust system undergoes rigorous quality checks and fixture testing to guarantee precise fitment. Every kit includes detailed installation instructions, making the process straightforward for most DIY enthusiasts. Valve operation integrates seamlessly—controlled via the factory PSE button, included valve controller fobs, and even compatible with HomeLink for added convenience.

LIFETIME WARRANTY:
Enjoy your SOUL exhaust components with confidence on both the street and track as they are covered by our Lifetime Warranty! Our team will quickly work with you to resolve any questions or issues that you may have.

Please note: This item is not a stock product. It is a special order part and once ordered with us is not subject to cancellation or return unless proven not fit for purpose or defected.

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

POR.981.VES

The product you are viewing cross references to these numbers

SOUL Valved Exhaust System.

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  

Designed for the naturally aspirated 3.8L flat-six engine, this performance exhaust replaces the original rear silencer assembly with a stainless steel system incorporating specially developed mufflers, electronically controlled exhaust valves and a selection of premium exhaust tips.

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.

How Do The Exhaust Valves Work:

Valves Closed – Refined Touring Sound

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.       

Why Upgrading Matters:
The SOUL Performance Valved Exhaust System is designed for drivers who want a more engaging exhaust note without permanently compromising daily driving comfort.

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.

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

POR.GT4.VES.

The product you are viewing cross references to these numbers