Active Autowerke BMW F87 LCI M2 Competition equal length exhaust mid-pipe (non resonated) for your M2 Competition. The Active Autowerke F87 Mid Pipe was specifically designed to eliminate the highly restrictive nature of the S55 – thus creating optimal exhaust flow and drastically improving performance. Engineered for an exact fit on the BMW M2 Comp, the difference in power with this mid-pipe will be noticeable the moment it is installed!