SOUL Street Headers Porsche 718 GT4 / Spyder / GTS 4.0L (2020+)

The SOUL Street Headers for the 718 GT4 / Spyder / GTS 4.0L upgrade your exhaust manifold to a fully optimized, high-flow header system — designed to replace the restrictive factory headers and catalytic setup without triggering check-engine lights. Built from mandrel-bent T304L stainless steel with carefully engineered cast flanges, smooth-radius tubing, and high-flow catalytic converters, these headers free up exhaust flow, sharpen throttle response, and give your flat-six a richer, more aggressive exhaust note. The result is a more lively engine feel, especially under acceleration, while preserving street-legal emissions and usability for daily driving or spirited weekend runs.

Fitment Notes

• Designed to fit Porsche 718 GT4, 718 Cayman/Boxster GTS / Spyder (4.0L flat-six, 2020 and newer). 

• Direct bolt-on installation — uses stock exhaust ports, flanges, and mounting points (OEM-style 3-bolt gaskets included).

• Uses high-flow catalytic converters for emissions compliance and to avoid check-engine lights, making it a “street-legal” header solution. 

• Minimal weight change — the Street Headers weigh roughly 1.5 lb (≈0.6 kg) less than the stock exhaust headers, so performance gains come without significant weight penalty.

Included

• Full set of stainless-steel primary headers with cast flanges and precision-machined ports

• High-flow catalytic converters integrated into header design (cat-retained version)

• New OEM-style three-bolt gaskets and appropriate mounting hardware

• Exhaust flanges manufactured to tight tolerances for precision fitment

• Instructions for installation; system is quality-checked and prepared for direct install

Product Specs

• Material: Heavy wall (≈ 0.065" wall) T304L stainless steel, mandrel-bent tubing

• Fitment: Porsche 718 GT4 / Spyder / GTS 4.0L (2020+) flat-six engines

• Weight: ~1.5 lb lighter than factory headers — minimal added mass for better flow and performance 

• Catalytic converter: High-flow HD 200-cell cat to maintain emissions compliance and avoid CEL (check-engine light)

• Build: USA-assembled, TIG-welded exhaust with port-matched flanges, smooth radius bends, and performance-oriented collector design to maximize scavenging and flow.

Product Features

• Improved Exhaust Flow & Throttle Response — Large-diameter, smooth-bend tubing and optimized collector geometry reduce back pressure, letting the engine exhale more freely for sharper response.

• Aggressive, Flat-Six Tone — Upgraded headers deliver a deeper, more muscular exhaust note and more satisfying tone under acceleration and load while remaining tame enough for street use.

• Street-Legal & CEL-Safe — Integrated high-flow catalytic converters and retained O₂ sensor compatibility avoid check-engine lights, preserving emissions compliance in stock or lightly modified cars.

• Bolt-On Install with OEM Fitment — Designed to install using factory mounting points and gaskets; no cutting, welding, or major modifications needed.

• Durable Stainless Construction — Thick-wall T304L stainless steel and precision TIG welding ensure long-term durability and resistance to thermal cycling — suitable for both street and occasional track use.

• Subtle Weight Advantage — Slight weight reduction over stock components adds marginal performance benefit without compromising structural integrity or heat tolerance.