BMW M4 (F82) - 2014-17. Akrapovic 14-17 BMW M3/M4 (F80/F82) Slip-On Line (Titanium) (Req. BMW M3 (F80) - 2014-17. The latest addition to the BMW M series is the awe-inspiring M3/M4, an exquisite high-performance car that can be made even better by adding an Akrapovič Slip-On exhaust system. ).