The Evolution titanium exhaust system for the BMW M3/M4 consists of a single-central muffler with valves and bigger link pipe tubes with a middle muffler, all designed to make the performance and workmanship of the Evolution as perfect as its looks. With no second set of cats—(unlike the stock system), the whole system is designed to give the smoothest flow—and the power and torque gains of the BMW with the Evolution system are simply amazing. Crafted entirely from titanium, the Evolution system has a unique sound to complement its substantial increase over a very wide rpm range. In-depth engineering has produced a sound completely different from the stock system, giving a deep and sporty sound – with no unwanted overtones or drone, and also a significant change to the sound with the valves in the open or closed positions. The Evolution system needs no re-programming of the ECU because it doesn’t trigger any warning lights. With tailpipes in titanium or carbon, and a handcrafted rear diffuser, all available as optional extras, the BMW Evolution is as beautiful as it is powerful. Models Supported: 2015+ BMW F80/F82/F83 M3 & M4 For more information call the EAS guys at (866) 669-0705 to place an order and schedule your installation!