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RENNKRAFT® Modular Street and Racing Headers with HJS Catalytic Converters
RENNKRAFT modular headers for the Porsche 718 Cayman/Boxster GT4, GTS and Spyder 4.0L (2020+), with a quick-release V-band connector that lets the owner swap between German-made German manufacturer of the high-flow catalytic converters Fabspeed fits in its sport cat products. 200-cell catalytic converters and Removes the catalytic converters entirely; legal only for closed-course track or off-road use, not street driving. pipes for track use. Mid-length, with F1-style Where header primary tubes join into one pipe, shaped to smooth exhaust pulses and improve scavenging., built from CNC mandrel-bent tubing in-house at Fabspeed. Adds around 31whp and 26 Nm of torque with the Sport Cats fitted, or 33whp and 33 Nm with the bypass pipes, while saving 0.9 kg or 3.2 kg respectively. Sport Cats give a louder, more raw exhaust note than stock; the bypass pipes bring a sound closer to a 911 Cup car.
Frequently asked
Does the RENNKRAFT® Modular Street and Racing Headers with HJS Catalytic Converters fit my 718 Boxster GTS 4.0?
This listing is specific to the Porsche 718 Boxster GTS 4.0. Exact fitment for your year, trim and options is confirmed on your free consult before anything is ordered.
What does the price include?
The delivered price includes the part from Fabspeed USA, freight to Australia, import costs and GST. Enter your postcode to refine delivery; the final figure is confirmed on consult.
How long until it arrives?
Every Fabspeed part is made in-house at Fabspeed USA with about a one-week production lead time, then allow another 3-4 days for delivery to Australia via UPS. That freight is already included in the price.
Can I switch between street and track configuration?
Yes, the modular V-band design lets you swap between the HJS 200-cell sport cats and the cat bypass straight pipes, according to Fabspeed.
Will it drone with the stock muffler?
No, Fabspeed says there is no drone whatsoever with the stock muffler in place, even with their Over Axle GPF Delete Pipes also installed.
Does the sound change much between the two configurations?
Yes. With the sport cats you get a louder, more raw note with defined high-frequency tones, while the cat bypass pipes bring a sound Fabspeed compares to a 911 Cup car.
How much power does each configuration add?
Fabspeed's dyno testing shows +31 whp and +26 Nm of torque with the Sport Cats, or +33 whp and +33 Nm of torque with the Cat Bypass Pipes.
Which option should I choose?
The RENNKRAFT headers use a quick-release V-band clamp. Sport Cats keeps HJS catalytic converters fitted for street use, no check engine light. Cat Bypass Pipes removes them for closed-track/off-road use only, with a louder CUP-car style sound. The combo gives you both sections to swap between.
Who installs it?
Rennen Motorsport in Adelaide, or an authorised dealer near you. Fitting it yourself may also be an option depending on the part, so raise it on your consult; professional installation is quoted separately.
Is it covered by warranty?
Fabspeed products carry the manufacturer's warranty, supported locally through Rennen Plus as the Australian principal. See our returns policy.
Can I just buy this outright, or do I need to talk to someone first?
Every enquiry, whether it's one part or a full build, starts with a free consult. We confirm the exact spec for your car before anything is quoted or ordered.
