Fabspeed Rennkraft Modular Performance Exhaust Headers for Porsche 718 GT4, Spyder & GTS (4.0L, 2022+)

Description

Fabspeed’s RENNKRAFT Modular Headers replace the restrictive stock manifolds on the 718 GT4 / GTS / Spyder — giving the 4.0-litre flat-six engine far better exhaust flow, sharper throttle response, and a significantly more aggressive, race-bred exhaust character. With a modular V-band design that lets you swap between high-flow catalytic converters for street use and cat-bypass straight pipes for track days, you get the best of both worlds: street-legal compliance (when using the cats) and full race-car freedom (with bypass). It’s the ultimate exhaust foundation for drivers who want real performance gains and an audible transformation without compromising versatility.

Fitment Notes

• Fits Porsche 718 GT4, GTS, and Spyder (4.0 L) model years 2020 and newer. 

• Direct bolt-on replacement for factory header assembly — designed from 3D OEM header scans to ensure precise fitment with stock exhaust mounts. 

• Modular V-band coupling enables easy switch between catalytic-converter configuration (for street or emissions legal use) and cat-bypass (straight-pipe) configuration for track use or maximum flow.

Included

• Left and right stainless-steel header assemblies (mandrel-bent T304L) with CNC-machined merge collectors. 

• German-made high-flow 200-cell catalytic converters (HJS) sized to fit in stock locations — maximizing flow while retaining emissions compliance when used. 

• V-band coupling hardware to switch between catted and cat-bypass configurations. 

• All required gaskets, flanges, and mounting hardware for a bolt-on installation — no cutting or welding needed.

Product Specs

• Material: Mandrel-bent T304L stainless steel headers.

• Configuration: Modular — V-band coupling allows use of catted layout or cat-bypass “straight-pipe” layout.

• Catalytic Converter: German HJS 200-cell high-flow cats (when installed). 

• Power Gains (stock downstream exhaust): +31 whp / +19 ft-lb (with Sport Cats), +33 whp / +24 ft-lb (with Cat Bypass) — at ~7200–7400 RPM.

• Weight Savings: ~ 7 lb (≈ 3.2 kg) lighter than factory headers when using cat-bypass configuration; ~2 lb (0.9 kg) lighter with Sport Cats compared to OEM.

• Exhaust Flow Efficiency: Flows approximately 93% of the equivalent straight-pipe volume of a 2.5″ pipe, even with catalytic converters in place. 

• Fitment: Bolt-on; uses factory exhaust ports and mounts.

Product Features

• Dual-Use Design — Street & Track Flexibility: Modular V-band coupling lets you easily switch between cat-equipped (street-legal, emissions-compliant) and cat-bypass (race / track) configurations, giving true versatility.

• Significant Power Gain Without Tuning: Gain ~30–33 whp and ~19–24 ft-lb torque out of the box over stock exhaust — impressive for a bolt-on header upgrade. 

• Improved Exhaust Tone & Character: With Sport Cats you get a louder, richer tone; with Bypass pipes, the exhaust note becomes raw and aggressive — closer to a race-prep car than a stock GT4. 

• Reduced Weight and Better Driving Dynamics: Less weight over stock combined with better flow helps the engine breathe easier, improves throttle response, and enhances the car’s overall agility and throttle feel.

• Perfect Fitment — No Modification Needed: Designed via OEM-scan data, these headers bolt straight on with existing mounts and plumbing, no cutting, welding, or fabrication required. 

• High-Quality Construction & Reliability: Built from premium stainless steel with precision merge collectors; backed by the manufacturer’s experience and quality control — suitable for both street driving and track use.

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