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 during all phases of driving. Together with incredible weight savings, the Evolution system dramatically changes the power-to-weight ratio. Our goal was to design a system that delivers a deep, rich growl at cruising speeds while also allowing the driver to enjoy an aggressive roar when driving hard. Complete the look with a set of two exquisite tailpipes in titanium or carbon fibre.When installing Akrapovič aftermarket optional down pipes with sports catalytic converters or without catalytic converters, which are developed for use on closed tracks only, remapping the ECU is mandatory. When installing Akrapovič aftermarket exhaust system that was developed for use on closed tracks, we recommend remapping the ECU in order to prevent potential »check engine light« warning signals. THIS PRODUCT DOES NOT MEET EMISSION COMPLIANCE REQUIREMENTS FOR STREET OR HIGHWAY USE.