Eisenmann Downpipe Exhaust for the BMW M3/M4
A turbo impeller wheel speed is mostly limited by the exhaust back pressure within the exhaust system. If one could eliminate some or most of this exhaust back pressure, the turbo will spoolmuch faster and effortlessly resulting in quicker engine revs and increase HP. Therefor this Eisenmann downpipe is a musthave for all BMW F80 M3 and BMW F82 M4 owners.
Eisenmann's performance exhausts are built by hand in germany from start to finish to create an old world craftsmanship simply not available with other exhaust manufacturers.