Akrapovic Evolution Line (Titanium) for BMW M6 Grand Coupé (F06)Akrapovic Evolution Line (Titanium) for BMW M6 Grand Coup (F06) The Evolution exhaust system made of our proprietary titanium consists of newly developed dual outlet mufflers with exhaust valves, flow optimized pipes, and a unique cast titanium X shaped part with resonators. Back pressure is lowered and the M6 Gran Coupe benefits from more power throughout the entire range of rpms. It increases responsiveness and an improved power to weight ratio has