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Valved Exhaust System
Fabspeed's valved exhaust design: valves open for full flow and an aggressive note, closed for a tone smoother than stock. Cat-back means everything from the catalytic converters to the tips; the factory headers and cats stay in place. exhaust system for the Porsche 981 Cayman GT4 and Boxster Spyder (2015-2016), built from 14-16ga T304L stainless steel with 2.5-inch mandrel-bent inlet tubes into a Valvetronic rear section and high-flow A crossover pipe joining the two exhaust banks into an X shape, smoothing flow for a fuller, balanced tone., fitted with Helical UK exhaust valves. Saves 3.2 kg over the factory rear muffler and bolts to the OEM catalytic converters as a cat-back system. Valves closed give a refined, quiet tone for street use; open, an aggressive note with burbles and backfires on downshift. Paired with Fabspeed's Race Headers output reaches 420hp (408hp with Sport Headers), with the torque dip near 3500rpm eliminated; tips are available in matte carbon fiber or in-house single-wall stainless.
Frequently asked
Does the Valved Exhaust System fit my Cayman GT4?
This listing is specific to the Porsche Cayman GT4 (981). 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.
Will it be quiet enough for daily driving?
Yes, Fabspeed designed the valves-closed setting to stay civil around town, while opening the valves brings a much louder, more aggressive roar with burbles and backfires.
Is it emissions legal?
Yes, Fabspeed describes it as cat-back and emissions legal, bolting onto the OEM Porsche catalytic converters.
How much power can the GT4 make with this exhaust?
Fabspeed states that combined with their Race Headers you can reach 420 hp, or 408 hp when paired with their Sport Headers.
What valves does it use?
It uses Helical Aerospace valves from the UK, which Fabspeed says are the same silicon-carbide valves used on the Porsche GT3 and GT3 RS.
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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