SOUL Porsche 718 GT4 RS / Spyder RS Valved Exhaust System

DEVELOPMENT GOALS

• Improve upon the factory design and achieve a throatier / smoother / higher pitched tone.
• The original tubing diameter—less than 2¼ inches— restricts power output. Although this design helps meet sound regulations and simplifies manufacturing, it doesn’t maximize the performance capabilities of the GT4 RS.
• Increase the presence and character of the exhaust note in the cabin while maintaining a reasonable level of resonance / drone while driving in both the valves closed and open modes.
• Heighten aggressiveness with valves open while maintaining an overall sound level potential / quality that can still be reasonably driven on the street in combination with other complimentary aftermarket exhaust components.
• Offer the ability to notably reduce the sound level of the car outside to fly under the radar when necessary.
• Achieve an effective delta in sound between both modes for two usable, well engineered experiences – mild and wild.

RESEARCH & DEVELOPMENT

With valves open, our Valved Exhaust System follows a similar design to our Race Exhaust System through an X-Pipe that merges the exhaust flow for a higher pitched, smooth sound. With valves closed, the exhaust is routed through smaller piping and a bespoke SOUL muffler we designed to fit with the X-Pipe in the confined space above the rear diffuser and meet our sound goals. This muffler was crafted to match our high standard of drone fighting mufflers like the rest of our existing Boxster / Cayman line that we have become known for.

Internally this muffler is quite unique. It has little to no restriction in the flow path, using straight through piping that is perforated to allow exhaust gasses to escape and become muffled in the surrounding packing material of the muffler body. We incorporated a second internal X-pipe to allow the exhaust flow to merge smoothly. These characteristics combined were crucial towards reducing and smoothing out the drone in the 1,800-3,000rpm range while enhancing that higher pitched note we were after in both the valves closed and open conditions.

Helmholtz resonators further reduce drone for a more refined cabin experience for a bold tone with minimal drone.

HAND-CRAFTED CONSTRUCTION

Mandrel bent, durable .065″” T304L stainless steel tubing

Back purged TIG welding (with ARCAL™ Prime argon gas) ensures proper weld penetration for exceptional strength and longevity

Water jet cut brackets are made to ISO 9001:2015 standards with ultra-tight tolerances of +/- 0.003 inches for extreme precision

Fabricated using thick-gauge aluminum fixtures that act as a heat sink during the welding process to prevent any warpage

EXHAUST TIP SELECTION

For those looking to maintain the factory appearance, this system can be used with OEM exhaust tips. However, the OEM tips feature a much smaller diameter inlet, requiring the system to be necked down, which introduces a restriction and reduces overall performance. To extract the most from your GT4 RS, we strongly recommend selecting our high-performance exhaust tips, designed to complement the full 3-inch system without any compromises. Choose between double wall tips or our Weissach style stainless steel tips.

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.

BACKED BY 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.

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.