BMW M2 (G87) Exhaust Systems

How to choose a G87 M2 exhaust

Cat-back, mid pipe and downpipe

An axle-back or cat-back replaces the rear of the exhaust. Milltek Sport describes its axle-back as close to stock volume with an improved tone, and its OPF-back, which removes the centre silencer, as louder with a deeper tone. A mid pipe replaces the middle section, and the Milltek mid pipes also remove the secondary catalytic converters and the OPF section. A downpipe is the first section, from the turbochargers, and comes with sports catalytic converters or as a cat-free or bypass pipe. Every downpipe here is listed for off-road or track use, and most ask for a remap or a delete module.

OPF cars, non-OPF cars and road use

The OPF is the petrol particulate filter in the mid section. Milltek lists OPF/GPF parts and separate parts for North American Specification (NAS) cars without one, and Akrapovic's link pipe fits both. If you are unsure which your car has, check its specification or ask us first. Akrapovic lists ECE type approval for its Slip-On Line on OPF-equipped M2 Coupés, and Remus lists its axle-back as EC approved. Milltek lists its mid pipes, mid-pipe cat-back, Z-Pipe and downpipes for off-road or competition use, and Akrapovic lists its downpipe and link pipe for track use. If a page states no approval, ask us rather than assume.

Drone, valve control and remaps

Drone is the resonant boom at a steady cruise. Akrapovic describes the Slip-On Line's dual valves and acoustic reflectors as giving a smooth, rich tone at a cruise. Milltek's plug and play valve control gives remote control of the valves and lists both OPF and non-OPF G87 cars. The Slip-On Line needs no remap, according to Akrapovic. Its link pipe and downpipe do, as do Milltek's large-bore downpipes, and Milltek's mid pipes may need a tune or an OPF delete cable.

Planning more than an exhaust? Our G87 M2 modding guide sets out the right build order, and our G87 M2 parts range covers the rest of the car.