SOUL Performance Products' Valved Exhaust System transforms the sound and exhaust flow of the Porsche 718 Cayman GT4 RS and 718 Spyder RS while retaining two genuinely distinct operating modes for aggressive driving and quieter cruising.
The factory GT4 RS rear muffler utilizes tubing measuring less than 2.25 inches, creating a restriction for the GT3-derived 4.0-liter flat-six. SOUL replaces this section with a purpose-built exhaust featuring a full 3-inch valves-open flow path and a bespoke X-pipe designed to produce a smoother, throatier, higher-pitched motorsports-inspired exhaust note.
With the valves open, exhaust flows through the high-flow X-pipe pathway for maximum sound and minimal restriction. With the valves closed, exhaust is redirected through SOUL's specially developed muffled secondary pathway. Straight-through perforated tubing, an internal X-pipe, muffler packing, and Helmholtz resonators work together to reduce exterior volume and control cabin resonance.
SOUL specifically developed the system to address drone between approximately 1,800 and 3,000 RPM, producing a meaningful difference between the valves-open and valves-closed modes without sacrificing the character of the 4.0-liter engine.
IMPORTANT: This Valved Exhaust System is NOT compatible with the factory Over Axle Pipes. Aftermarket Over Axle Pipes are required for installation.
Fits:
Porsche 718 Cayman GT4 RS – 2022+
Porsche 718 Spyder RS – 2024+
Does not fit:
Porsche 718 Cayman GT4 RS Clubsport
Required for installation:
SOUL Competition Over Axle Pipes
SOUL Resonated Over Axle Pipes
SOUL Sport Cat Over Axle Pipes
Or another compatible aftermarket Over Axle Pipe system
This exhaust will not fit with the factory Over Axle Pipes.
Compatible with factory or upgraded headers when used with compatible aftermarket Over Axle Pipes.
The valves-open configuration is designed for maximum sound, flow, and exhaust character.
Full 3-inch exhaust pathway
Bespoke X-pipe design
Smooth, higher-pitched exhaust note
Increased exterior volume
Increased cabin presence
Reduced restriction compared with the factory rear muffler
Aggressive GT3-inspired motorsports character
With the valves closed, exhaust is redirected through SOUL's secondary muffled pathway.
Substantially reduced exterior volume
Reduced cabin resonance and drone
Straight-through perforated internal muffler tubing
Internal secondary X-pipe
Helmholtz resonators
Specifically engineered to smooth drone in the approximately 1,800–3,000 RPM range
Designed to provide a more comfortable cruising experience
The result is a true mild-to-wild exhaust system with two distinct sound characteristics.
SOUL incorporated advanced anti-drone components into the Valved Exhaust System that occupy additional space around the rear exhaust assembly.
Because of this packaging, the system physically cannot be installed with the factory Over Axle Pipes.
The Valved Exhaust must therefore be paired with compatible aftermarket Over Axle Pipes, including SOUL Competition, Resonated, or Sport Cat Over Axle Pipes.
Customers looking for a complete OAP and Valved Exhaust solution should consider the SOUL Street Package.
SOUL's traditional performance exhaust tip design featuring double-wall construction and an outlet designed to complement the full 3-inch exhaust system.
Available in:
Signature Satin
Matte Black
A motorsports-inspired stainless-steel exhaust tip design influenced by the factory Weissach-style outlets while maintaining the larger flow area of SOUL's exhaust system.
Available in:
Signature Satin
Matte Black
The factory Porsche exhaust tips can also be retained for customers who prefer the original appearance.
Because the factory tips have a significantly smaller inlet diameter, using them requires the SOUL exhaust to neck down at the outlet. This introduces additional restriction compared with SOUL's full-size Slash Cut Double Wall or Weissach tips.
For maximum exhaust flow, SOUL recommends its larger aftermarket exhaust tips.
Valved rear exhaust replacement
Full 3-inch valves-open exhaust pathway
Bespoke X-pipe architecture
Two distinct exhaust modes
Higher-pitched and smoother valves-open exhaust character
Significantly reduced sound with valves closed
Straight-through muffler construction
Internal secondary X-pipe
Helmholtz resonators
Anti-drone engineering targeting approximately 1,800–3,000 RPM
Requires aftermarket Over Axle Pipes
Not compatible with factory Over Axle Pipes
Choice of Slash Cut Double Wall, Weissach, or factory OEM exhaust tips
Constructed from 0.065-inch-wall T304L stainless steel
Mandrel-bent tubing
Back-purged TIG-welded construction
Water-jet-cut mounting brackets
Brackets manufactured to ISO 9001:2015 standards
Approximately ±0.003-inch manufacturing tolerances
Fabricated in heavy-duty fixtures to minimize heat distortion during welding
New high-grade installation hardware included
Designed and built in-house in Willow Grove, Pennsylvania
Backed by SOUL Performance Products' Lifetime Warranty for street and track use
The Valved Exhaust System provides separate valves-open and valves-closed exhaust paths.
SOUL's optional Valve Controller Kit can be used to provide greater control over valve operation and maintain the desired exhaust mode throughout the engine's rev range.
The Valve Controller Kit is not included with the exhaust system unless purchased separately.
DasMotoring Notes
This is the best SOUL rear exhaust choice for GT4 RS and Spyder RS owners who want more sound and performance potential without going to a fixed-volume race exhaust. If you want the car to have two personalities — louder and more aggressive with the valves open, calmer with the valves closed — this is the setup to choose.
Because this system is not compatible with factory over-axle pipes, make sure your build includes SOUL Competition Over Axle Pipes, SOUL Sport Cat Over Axle Pipes, or another compatible aftermarket over-axle pipe option.
SOUL allows this system to be configured with OEM exhaust tips, but the factory tips have a smaller inlet diameter. Reusing the OEM tips requires the system to neck down near the tips, which creates a restriction. For best performance and flow, DasMotoring recommends selecting SOUL’s matching high-flow tips instead of reusing the factory tips.
SOUL Performance Products' Valved Exhaust System transforms the sound and exhaust flow of the Porsche 718 Cayman GT4 RS and 718 Spyder RS while retaining two genuinely distinct operating modes for aggressive driving and quieter cruising.
The factory GT4 RS rear muffler utilizes tubing measuring less than 2.25 inches, creating a restriction for the GT3-derived 4.0-liter flat-six. SOUL replaces this section with a purpose-built exhaust featuring a full 3-inch valves-open flow path and a bespoke X-pipe designed to produce a smoother, throatier, higher-pitched motorsports-inspired exhaust note.
With the valves open, exhaust flows through the high-flow X-pipe pathway for maximum sound and minimal restriction. With the valves closed, exhaust is redirected through SOUL's specially developed muffled secondary pathway. Straight-through perforated tubing, an internal X-pipe, muffler packing, and Helmholtz resonators work together to reduce exterior volume and control cabin resonance.
SOUL specifically developed the system to address drone between approximately 1,800 and 3,000 RPM, producing a meaningful difference between the valves-open and valves-closed modes without sacrificing the character of the 4.0-liter engine.
IMPORTANT: This Valved Exhaust System is NOT compatible with the factory Over Axle Pipes. Aftermarket Over Axle Pipes are required for installation.
Fits:
Porsche 718 Cayman GT4 RS – 2022+
Porsche 718 Spyder RS – 2024+
Does not fit:
Porsche 718 Cayman GT4 RS Clubsport
Required for installation:
SOUL Competition Over Axle Pipes
SOUL Resonated Over Axle Pipes
SOUL Sport Cat Over Axle Pipes
Or another compatible aftermarket Over Axle Pipe system
This exhaust will not fit with the factory Over Axle Pipes.
Compatible with factory or upgraded headers when used with compatible aftermarket Over Axle Pipes.
The valves-open configuration is designed for maximum sound, flow, and exhaust character.
Full 3-inch exhaust pathway
Bespoke X-pipe design
Smooth, higher-pitched exhaust note
Increased exterior volume
Increased cabin presence
Reduced restriction compared with the factory rear muffler
Aggressive GT3-inspired motorsports character
With the valves closed, exhaust is redirected through SOUL's secondary muffled pathway.
Substantially reduced exterior volume
Reduced cabin resonance and drone
Straight-through perforated internal muffler tubing
Internal secondary X-pipe
Helmholtz resonators
Specifically engineered to smooth drone in the approximately 1,800–3,000 RPM range
Designed to provide a more comfortable cruising experience
The result is a true mild-to-wild exhaust system with two distinct sound characteristics.
SOUL incorporated advanced anti-drone components into the Valved Exhaust System that occupy additional space around the rear exhaust assembly.
Because of this packaging, the system physically cannot be installed with the factory Over Axle Pipes.
The Valved Exhaust must therefore be paired with compatible aftermarket Over Axle Pipes, including SOUL Competition, Resonated, or Sport Cat Over Axle Pipes.
Customers looking for a complete OAP and Valved Exhaust solution should consider the SOUL Street Package.
SOUL's traditional performance exhaust tip design featuring double-wall construction and an outlet designed to complement the full 3-inch exhaust system.
Available in:
Signature Satin
Matte Black
A motorsports-inspired stainless-steel exhaust tip design influenced by the factory Weissach-style outlets while maintaining the larger flow area of SOUL's exhaust system.
Available in:
Signature Satin
Matte Black
The factory Porsche exhaust tips can also be retained for customers who prefer the original appearance.
Because the factory tips have a significantly smaller inlet diameter, using them requires the SOUL exhaust to neck down at the outlet. This introduces additional restriction compared with SOUL's full-size Slash Cut Double Wall or Weissach tips.
For maximum exhaust flow, SOUL recommends its larger aftermarket exhaust tips.
Valved rear exhaust replacement
Full 3-inch valves-open exhaust pathway
Bespoke X-pipe architecture
Two distinct exhaust modes
Higher-pitched and smoother valves-open exhaust character
Significantly reduced sound with valves closed
Straight-through muffler construction
Internal secondary X-pipe
Helmholtz resonators
Anti-drone engineering targeting approximately 1,800–3,000 RPM
Requires aftermarket Over Axle Pipes
Not compatible with factory Over Axle Pipes
Choice of Slash Cut Double Wall, Weissach, or factory OEM exhaust tips
Constructed from 0.065-inch-wall T304L stainless steel
Mandrel-bent tubing
Back-purged TIG-welded construction
Water-jet-cut mounting brackets
Brackets manufactured to ISO 9001:2015 standards
Approximately ±0.003-inch manufacturing tolerances
Fabricated in heavy-duty fixtures to minimize heat distortion during welding
New high-grade installation hardware included
Designed and built in-house in Willow Grove, Pennsylvania
Backed by SOUL Performance Products' Lifetime Warranty for street and track use
The Valved Exhaust System provides separate valves-open and valves-closed exhaust paths.
SOUL's optional Valve Controller Kit can be used to provide greater control over valve operation and maintain the desired exhaust mode throughout the engine's rev range.
The Valve Controller Kit is not included with the exhaust system unless purchased separately.
DasMotoring Notes
This is the best SOUL rear exhaust choice for GT4 RS and Spyder RS owners who want more sound and performance potential without going to a fixed-volume race exhaust. If you want the car to have two personalities — louder and more aggressive with the valves open, calmer with the valves closed — this is the setup to choose.
Because this system is not compatible with factory over-axle pipes, make sure your build includes SOUL Competition Over Axle Pipes, SOUL Sport Cat Over Axle Pipes, or another compatible aftermarket over-axle pipe option.
SOUL allows this system to be configured with OEM exhaust tips, but the factory tips have a smaller inlet diameter. Reusing the OEM tips requires the system to neck down near the tips, which creates a restriction. For best performance and flow, DasMotoring recommends selecting SOUL’s matching high-flow tips instead of reusing the factory tips.
