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Muffler Bypass Exhaust System
Fabspeed's Muffler Bypass Exhaust System deletes the restrictive rear muffler on the F30/F32 335i and 435i, shedding 14 lbs and letting the N55 engine's voice come through. Expect an intoxicating, menacing barrage of pops and crackles on deceleration; in-cabin tone stays reasonable, and Fabspeed says it's still comfortable as a daily driver even paired with their Sport Cat Downpipe. Built from 14-16 gauge T304L stainless steel piping, it includes Deluxe Dual-Style Tips in your choice of finish. Installation requires cutting the factory exhaust at a marked breakpoint; the kit installs over the factory piping with an included Torca clamp, and the factory muffler can be reinstalled later, handy if the car is leased.
Frequently asked
Which cars does the Muffler Bypass Exhaust System fit?
Fits your BMW 335i/435i (N55) (2011-2015). Fabspeed lists this piece for: BMW 335i & 435i (F30/F32). 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 too loud for daily driving?
Fabspeed says in-cabin tone stays reasonable, and it's comfortable as a daily driver even with their Sport Cat Downpipe also installed.
How much weight does it save?
14 lbs from the rear of the vehicle.
Does installation require cutting the exhaust?
Yes, you cut the factory exhaust at a marked breakpoint, then the system clamps over the factory piping.
Can I put the factory muffler back on later?
Yes, reinstalling the factory rear muffler is quick and easy, useful if the car is leased.
Which option should I choose?
Tip finish is mostly a styling call: polished stainless steel and satin black are sized to match the factory look, while carbon fiber tips run a slightly larger 3.5-inch diameter. Titanium is also offered. Pick whichever best matches the rest of your car's finish.
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.
