Active Autowerke BMW M3/M4 Non-Equal Length Exhaust Midpipe (F80/F82/F83)Active Autowerke exhaust mid pipe for the BMW F80 M3 and F82 M4. The standard Active Autowerke Mid Pipe was specifically designed to eliminate the highly restrictive nature of the S55's factory exhaust system thus creating optimal exhaust flow and drastically improving performance. Engineered for an exact fit on the BMW F80 M3 and F82 M4, the difference in power and throttle response with this mid pipe will be noticeable the moment it is installed!
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Active Autowerke BMW M3/M4 Non-Equal Length Exhaust Midpipe (F80/F82/F83)