SOUL Performance Exhaust System. Porsche 981 GT4 / Boxster Spyder / Clubsport › POR.GT4.ESX.

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.