This SAC from the M division of BMW is a tour de force. Add the Akrapovič Evolution performance exhaust system for improved power, reduced weight, and better sound. The Evolution is a complete “catalytic converter back system” and comprises titanium link pipes with resonators, a titanium X-pipe, and a muffler with integrated valves. It dramatically reduces back pressure and enhances power delivery. The sound is transformed thanks to the dual-mode exhaust flap system, which helps deliver a deeper but civilized sound at low revs and a sportier exhaust note at higher revs, all without droning. Complete the look with a set of four exquisite 100 mm tailpipes in titanium or carbon fibre. Further tuning opportunities exist with our stainless steel high-flow down pipes.