Take the sound of your 4.0L V8 M3 to the next level with this axle-back system from Corsa. An increased flow of 7% and a weight savings of 16 pounds not only mean an increase in sound but performance as well. The patented RSC technology allows for aggressive sound under wide-open throttle and a drone-free experience with cruising. Featuring a lifetime warranty this system not only performs but will withstand the test of time no matter what environment.