Akrapovic Evolution Line (Titanium) for BMW M3 (E90) 2013Akrapovic Evolution Line (Titanium) for BMW M3 (E90) 2013 The Evolution performance exhaust system for the BMW M3 consists of dual outlet mufflers, flow optimized link pipes, and an X pipe that incorporates high flow 100 cpsi sports catalytic convertors and resonators. The power and torque gains of the BMW M3 with the Evolution system are just amazing. A substantial increase is detected over a very wide rpm range, and so it increases responsiveness