Porsche 718 GT4 RS / Spyder RS SOUL Street Package


Combining our free-flowing Over Axle Pipes with our Valved Exhaust System eliminates the major bottlenecks in the GT4 RS exhaust flow and extracts the most sound and performance potential for the platform, but still allows for comfortable cruising with the valves closed. Owing to the unique oval design of our Over Axle Pipes and the Valved Exhaust’s x-pipes, this system runs a full 3 inches all the way through, ensuring that the 4.0-liter flat-six realizes its motorsports pedigree in every way.


+  Fits Porsche 718 GT4 RS / Spyder RS with factory or upgraded headers
+  No check engine light on North American cars, ECU tuning required for European cars
+  All SOUL Performance Products exhaust components are backed by the industry’s first and finest Lifetime Warranty for both street and track use
+  Designed and built in-house at our Willow Grove, PA facility

NOTE: Because of the increased output of the GT3-derived engine in 718 RS models, and the additional heat generated as a result, we strongly recommend applying a thermal management solution to Over Axle Pipe products to protect nearby components and body parts. We offer Jet-Hot ceramic coating in-house or can recommend simple and effective exhaust wrapping options via DEI.

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DEVELOPMENT: Acting on our initial goal of maximizing sound and performance potential from a cat-back exhaust system delivered us immediate results with our Over Axle Pipes and rear exhaust system. But for those who’d like to dial it back when appropriate, a Valved Exhaust System would meet their sound goals with valves open AND valves closed. With a full 3-inch X-Pipe in either valve operating condition, that wonderful high-pitched flat-six sound comes to life but can be suppressed when necessary. Combined with Competition or Resonated Over Axle Pipes, that sound can be further amplified along with a boost in performance by uncorking that factory bottleneck. It is a complete package for those who truly want it all. Unfortunately, there was more that it came with: drone.

To drivers who opt for the civility of a Valved Exhaust System, excess drone is not an acceptable byproduct. The GT4 RS’ potent 4.0-liter flat-six brings plenty of it, especially once we’ve turned up the volume on it. Instead of just accepting defeat, we went after a solution, even as it required several evolutions and plenty of testing. Our design of “drone canisters” was finalized and installed as it successfully hit the volume requirements we calculated to target the drone frequencies in the low-to-mid 2,000 RPM range, shifting the drone zone down the rev range and reducing peak frequencies significantly. As a result, drivers can enjoy the motorsports tone that our X-Pipe creates in its fullest expression, or mute it when necessary and cruise comfortably.

Due to the design of the system with these drone canisters, fitment is only possible when combined with aftermarket Over Axle Pipes. Our Street Package pairs our Valved Exhaust System with our Over Axle Pipes for a remarkable change in character and volume with valves open, but drone reduced as much as possible with valves closed for as civilized a cruising experience as we could develop—especially driven in Sport mode where the optimal shift points during typical driving are outside the peak “drone zone.” This package allows the OAPs to be optioned as Competition or Resonated, with the Competition selection offering more overall sound level potential with valves open, closer to the Race Exhaust Package. The Resonated version allows for a more modest sound level potential, additionally reducing the drone level at lower revs and producing a smoother tone. For those heading to the track and looking to shed every bit of weight possible, our drone canisters are accessible to removal/install from under the car without removal of the wheels or undertray/diffuser, and we will be offering drone canister “block-off kits” to drop an additional 8.5 lbs off the car. You’ll be able to hear the difference in drone once the canisters are removed or re-installed!


CONSTRUCTION:  Each system is assembled in house in the USA out of mandrel bent, thick wall .065″” T304L stainless steel. Back purged TIG welding (with ARCAL™ Prime argon gas) ensures proper weld penetration and longevity. Water jet cut flanges are made to ISO 9001:2015 standards with tolerances of +/- 0.003 inches for extreme precision. We fabricate these over axle pipes using thick gauge aluminum fixtures which act as a great heat sink during the welding process and prevent warping not only of our products, but the fixtures themselves to ensure perfect fitment.

BOLT ON AND GO:  Every component is rigorously quality-checked, tested in a fixture to guarantee fitment, and then foam packed to ensure they arrive in perfect condition. New high-grade hardware is included for installation.

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.