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Sport Cat Downpipes
Fabspeed's Sport Cat Downpipes fit the G8x M3 and M4 with the largest HJS catalytic converter that fits the chassis, chosen in consultation with HJS Motorsport for the best combination of flow, reliability and sound. It flows 93% of a 3-inch straight pipe while staying emissions compliant with no check engine light, so there's no need to run cat-bypass pipes. Expect a subtle increase in exhaust volume with more deceleration pops and burbles, and no added interior An unwanted droning resonance at certain highway rpm, where exhaust pulses match the cabin's natural frequency. — add Fabspeed's Intermediate X-Pipe for a more aggressive note. On Fabspeed's dyno it made maximum gains of 23 ft-lbs of torque at 3,200rpm and 20whp at 6,500rpm (23 crank hp), with gains carried through the whole power band. Built from Bent over an internal mandrel so the tube keeps a constant diameter through the bend, unlike crush-bending. 14-16 gauge T304L stainless steel, it's a simple bolt-on that saves 2 lbs (0.9kg) over the factory system.
Frequently asked
Which cars does the Sport Cat Downpipes fit?
Fits your BMW M2 (G87, 2023+). Fabspeed lists this piece for: BMW M2, M3 & M4' (G80/G82/G87) sedan/coupe vehicles including Competition Models worldwide (2021+) (RWD & AWD). 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 it add?
Fabspeed's dyno testing showed maximum gains of 23 ft-lbs of torque at 3,200rpm and 20whp at 6,500rpm (23 crank hp), gained across the whole power band.
Will it trigger a check engine light?
No, it's designed to be emissions compliant with no check engine light.
Will I need cat bypass pipes too?
No, Fabspeed says there's no need to run cat bypass pipes alongside this downpipe.
How can I get a more aggressive exhaust note?
Add Fabspeed's Intermediate X-Pipe; the Sport Cat Downpipe alone gives a subtler increase in volume with no drone.
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.
