The ARM F82 M4 Downpipes are the ultimate solution for more power, sharper throttle response and a better exhaust note on your S55-powered M4. Catless downpipes are a standard upgrade for any F82 owner pushing past basic Stage 1: higher boost increases back-pressure at the OEM cats, choking the turbos and shortening their life. The ARM downpipes relieve that back-pressure so the exhaust flows freely — adding power and torque while extending turbo longevity. On ARM's test car, the downpipes plus a Stage 2 flash made 543 whp / 547 wtq — gains of 73 whp and 126 wtq over stock. Highlights Up to +30 whp / 30 wtq. Enhanced exhaust note. 304 stainless steel. Improved turbo spool. Rumble, not rasp The Resonated S55 downpipes use 4" resonators in the ideal location to give a deep, aggressive tone that stands out next to the familiar high-pitched rasp of other catless downpipes — without compromising fitment. Prefer fewer emissions? Opt for the catted version, which swaps the resonators for 200-cell catalysts. Construction Precision CNC-machined V-band flanges feed a 3" SS304 body that transitions smoothly and gradually from the 3" inlet down to the 2.5" OEM midpipe size — avoiding the turbulence caused by abrupt reducers on some aftermarket downpipes. Fitment (S55 3.0L) BMW F80 M3, F82 M4, F83 M4, F87 M2 Competition. What's included: ARM resonated downpipes, CNC-machined bracket for the front-turbo downpipe, 4x downpipe-to-midpipe bolts/nuts. Backed by ARM Motorsports' lifetime warranty against defects in craftsmanship and fitment. Emissions disclaimer: This product is intended for off-road, race, or closed-course competition use only and is not legal for use on pollution-controlled vehicles operated on public roads in most states and provinces. You are responsible for compliance with all applicable emissions laws. Please check your local laws before purchase and installation. Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email [email protected].
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