SOUL Performance Resonated Over Axle Pipes for 982 Porsche 718 Boxster GTS 4.0 and Cayman GT4 / Spyder / GTS 4.0

SOUL Performance developed the Resonated Over Axle Pipes for the Porsche 718 GT4, Spyder, and GTS 4.0L  to replace the factory over axle pipes that use dense particulate filters, which restrict the tone and character of the 4.0L engine. Through extensive analysis and 3D scanning, SOUL engineered a one-piece, full 2.25-inch design with large-radius mandrel bends for an optimized street-and-track upgrade, and the resonated configuration is designed to deliver the flow benefit of removing OPF restrictions without a large increase in overall volume while helping reduce rasp, drone, and low-RPM resonance when paired with other exhaust modifications. For owners running aftermarket headers or a rear exhaust, SOUL’s straight-through stainless race resonators are intended to take the edge off the sound and target unwanted frequencies without sacrificing performance. Built in-house in Willow Grove, PA, each set is constructed from mandrel-bent, thick-wall .065-inch T304L stainless steel with back-purged TIG welding and ISO 9001:2015-spec waterjet-cut flanges for long-term durability and precise fitment. Designed for North American vehicles, the setup is intended to help avoid a check engine light and provides a 9.4lb (4.2kg) weight savings versus factory components (13.8lb vs 23.2lb). Configured here with the optional heat solution set to No, each kit is quality-checked, fixture-tested, foam packed, and supplied with new high-grade hardware, backed by SOUL Performance’s lifetime warranty for both street and track use.

Development

Construction

• SOUL Performance assembles each set in-house in the USA using mandrel-bent, thick-wall .065-inch T304L stainless steel. Back-purged TIG welding with ARCAL Prime argon gas is used to ensure proper weld penetration and long-term durability. Waterjet-cut flanges are produced to ISO 9001:2015 standards with +/- 0.003-inch tolerances for exceptional precision. These over axle pipes are fabricated in thick-gauge aluminum fixtures that act as a heat sink during welding, helping prevent warping of both the components and the fixtures to maintain consistent, precise fitment. SOUL Performance’s Race Resonators feature full stainless steel construction with a straight-through perforated core to maximize exhaust flow while reducing undesirable frequencies.

Bolt on and Go

• SOUL Performance rigorously inspects every component, fixture test-fits each system to verify precise fitment, and foam packs everything to ensure it arrives in perfect condition. Each kit includes new high-grade hardware and four OEM Porsche gaskets for installation.

Features

• Resonated over axle design removes OPF restrictions with controlled volume
• Helps reduce rasp, drone, and low-RPM resonance
• One-piece, full 2.25-inch routing with large-radius mandrel bends
• Intended to help avoid a CEL on North American vehicles
• .065-inch T304L stainless, back-purged TIG welded, ISO-precision waterjet flanges
• Straight-through stainless race resonators for max flow and frequency control
• Fixture test-fit, foam packed, includes new hardware + four OEM Porsche gaskets
• Backed by SOUL Performance lifetime warranty (street and track)

Applications

• Porsche 718 Boxster GTS 4.0: 982 | 2020-2025 | MDG – 4.0L F6
• Porsche 718 Cayman GT4: 982 | 2020-2025 | MA2.71 – 4.0L F6
• Porsche 718 Cayman GTS 4.0: 982 | 2020-2025 | MA2.70 – 4.0L F6
• Porsche 718 Spyder: 982 | 2020-2025 | MA2.71 – 4.0L F6

About SOUL Performance

• SOUL Performance Products was founded by a group of automotive enthusiasts with deep industry experience and a commitment to doing right by their customers. Their mission is to deliver outstanding performance parts at fair pricing, backed by quality service and one of the best warranties in the industry. SOUL develops high-performance exhaust systems and components that are engineered for exceptional sound and proven performance, with products ready to ship quickly worldwide. Guided by core values of honesty, transparency, and passion for cars, they build strong community connections and prioritize customer satisfaction at every step. Operating out of a dedicated facility in Willow Grove, Pennsylvania, SOUL combines hands-on research, engineering, and manufacturing expertise to create parts that meet and exceed the demands of serious enthusiasts.