Porsche 718 GT4 / Spyder / GTS 4.0L SOUL Resonated Over Axle Pipes


The factory over axle pipes have dense particulate filters which heavily restrict the tone and character of the 4.0L engine. SOUL Resonated Over Axle Pipes increase performance while reducing rasp and drone when paired with other exhaust upgrades.

Fits all 4.0L Porsche 718 GT4 / GTS Cayman and Spyder vehicles (2020+) in North America. Most European vehicles have additional monitored ports on the factory pipes.
All Soul Performance Products exhaust components are backed by the industry’s first and finest Lifetime Warranty for both street and track use
+  No check engine light on North American cars
+  Weighs 9.4 lbs / 4.2 kg less than factory exhaust components (13.8 lbs vs 23.2 lb)
+  Designed and built in-house at our Willow Grove, PA facility

Porsche 718 GT4 / Spyder / GTS 4.0L Drone Reduction Sound Symposer Delete

Easily plug your 718's sound symposer to reduce in cabin drone!

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DEVELOPMENT:  We analyzed every aspect of the 718 GT4 exhaust system to determine sizing, positioning, and flow characteristics of our components. 3D scanning enabled us to create a perfect bend profile to produce beautiful large radius mandrel bends and a one piece full 2.25″ design. The end result is a highly optimized upgrade for your Porsche for both street and track use! Many enthusiasts modify multiple portions of the exhaust system in pursuit of power and tone which can increase the volume and cabin presence beyond their preference. The primary benefit of the resonated version of our over axle pipes is gaining the performance increase of removing OPF filters without increasing volume to a great degree, whereas the Competition Over Axle Pipes offer bolder tone and volume. If you’re running aftermarket headers or rear exhaust our straight through race resonators take the edge off the overall volume and reduce bass / resonance at low RPM for a more refined experience.

Curious which components are perfect for you? We’re happy to chat with you to ensure you get exactly what you’re looking for!


CONSTRUCTION:  Each set 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. Our Race Resonators are full stainless steel construction with a straight through perforated design to achieve maximum exhaust flow while cutting down on undesirable frequencies.


BOLT ON AND GO:  Each set 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.

JET-HOT CERAMIC COATING:  With superior thermal management and corrosion resistance properties that lower surrounding temperatures by up to 65%, increased protection from thermal oxidation, galvanic corrosion and the ability to withstand 2000°F surface temperatures, there is no question as to why Jet-Hot Extreme 2K remains the industry leader in exhaust coatings.  An improvement over standard heat shields, ceramic coating is done professionally by Jet-Hot on both the outside AND inside of the exhaust for the best possible heat management. By keeping the velocity of the exhaust high, these coatings actually cause your exhaust gases to flow faster and decrease thermal tumbling which leads to improved power as well. Ceramic coatings keep away oil, gas, salt, and other metal degrading materials that your parts come into contact with every day as an added benefit. Classic Polish is the default finish choice as it is the Extreme 1300 base coat appearance (and most effective without a color top coat) but color top coats are optional with an extended lead time and additional charge.

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.


  1. Josh Sechrist

    I have some first hand experience to share with these new resonated OAPs when combined with the Valved Rear System. I’m very happy with this combination for my taste.

    I was after a little less cabin resonance and a more street friendly sound level. The Resonators do help control cabin boom/resonance, the impact is small yet noticeable back-to-back. I find they also help control overall tone and volume. If you are familiar with the tone of the valved rear system with standard OAPs, throaty, gurgles, and some crackles. These resonators certainly dampen some of that and yield a slightly higher pitch in overall tone, I feel the right amount. Sound is subjective, for my personal taste, I think without the resonators the outside sound is just at the line or slightly over for a street setup. With the resonators, I find it perfect, just rowdy enough but slightly refined. On a 1-10 rowdy scale, rear box only is a 4, rear + resonated OAPs is 6-7, and rear + OAPs is 8.

  2. jimdillard (Rennlist)

    I have the SOUL Ceramic-Coated Resonated OAP’s installed on my 2022 Spyder in concert with the Cargrahpic 2-mode exhaust valve controller. IMV the SOUL Resonated OAP’s are the “Godilocks Solution”…not too loud…not too quiet…but JUST RIGHT. My wife even likes them! We took a 250-some-odd-mile drive yesterday over the beautiful curvy, hilly backroads in Tennessee and Alabama. We drove with the exhaust valves OPEN until we reluctantly climbed aboard the interstate after dark to get home, and decided to go exhaust valves CLOSED for more serene driving on the drive home in the dark. But rest assured…when I start the car at our home…the first thing I do is ensure I’m in the “LOUD MODE” with the exhaust valves open because I LOVE THE SOUND of these SOUL RESONATED OAP’s!

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