The ARM S55 Single Midpipe Upgrade is the ultimate way to enhance the power and sound of your F8X. Its resonated 3.5" design delivers improved exhaust flow and an incredible note — tuning out the high-pitched rasp the S55 is known for. Highlights Up to +20 whp / 30 wtq. Improved exhaust note. 304 stainless steel. Faster turbo spool; fits OEM and aftermarket mufflers. Construction Mandrel-bent 304 stainless for smooth, unrestricted flow. At just 17 lbs it cuts 15 lbs from the exhaust (40 lbs when paired with the ARM S55 Track Exhaust). It starts with a precision Y-pipe at the downpipe connections (fits any downpipe that mates to the OEM midpipe, including the ARM S55 Downpipes), incorporates a 4.5" resonator to deepen the tone, then transitions to a second Y-pipe with two included 2.5" pipes to reconnect the OEM muffler or ARM S55 Track Exhaust. Because of its larger size, the included 6061 aluminum under-brace replaces the OEM brace and bolts to the factory mounting points. Fitment (S55 3.0L) BMW F80 M3, F82 M4, F83 M4 (fits any downpipes that connect to the OEM midpipes). What's included: ARM S55 midpipe, CNC-machined brace, 5x exhaust clamps. Backed by ARM Motorsports' lifetime warranty against defects in craftsmanship and fitment. 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].
