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Rennkraft US Patented Modular Headers with Catalytic Converters
US-patented Fabspeed's patented modular design that lets you swap between a catalytic converter and a straight-through bypass pipe on the same mount. modular headers for the Porsche 981 Boxster/Cayman Base, S and GTS (2013-2016), plus 2016 GT4 3.8-litre cars, with a quick-release V-band connector that swaps between HJS German-imported 200-cell catalytic converters and cat-bypass straight pipes. Dyno testing showed gains of 25 hp and 20 lb-ft of torque, saving 2 lb with the sport cats fitted or 7 lb with the cat bypass, versus the factory headers. With the sport cats it's more aggressive and raw while staying street legal and EPA compliant; with the cat bypass pipes it sounds much closer to a 911 Cup car, which isn't legal for street use. Built from CNC mandrel-bent T304L stainless steel with F1-style merge collectors.
Frequently asked
Which cars does the Rennkraft US Patented Modular Headers with Catalytic Converters fit?
Fits your 981 Cayman GT4. Fabspeed lists this piece for: Porsche 981 Boxster / Cayman Base; GTS from 2013-2016; 2016 GT4 3. 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.
How much power does this add?
Dyno testing showed gains of 25 hp and 20 lb-ft of torque.
Can I swap between the cat and bypass configurations myself?
Yes, the patented RENNKRAFT quick-release V-band connector lets you swap between the HJS catalytic converters and the cat bypass pipes on the same header.
Is the cat bypass configuration street legal?
No, with the cat bypass pipes installed the sound and setup is closer to a 911 Cup car and is not legal for street use.
Which option should I choose?
Choose Sport Cats to keep the car street legal and EPA compliant with HJS German catalytic converters fitted, or Cat Bypass Pipes for closed-track, race-only use where the cats are removed entirely. Sport Cat + Cat Bypass Pipes buys both, so you can run catted on the street and swap in the bypass pipes for track days using the same quick-release RENNKRAFT connector, without buying a second header.
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.
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