The S58 twin-turbo inline-six is one of the finest engines BMW has ever built, and the Corsa Performance Active cat-back exhaust for the G80 M3 and G82/G83 M4 finally gives it the voice it deserves. With the valves open, it’s 17 dB louder than stock (SAE-measured) and flows 31% better, delivering a sharp climb to redline, a deep bark at wide-open throttle, and crackle on overrun
