BMW G80/G82 M3/M4

The G80 M3 and G82 M4 share one exhaust architecture, so we treat them as a single platform: everything we develop on the G8X fits both cars identically.

The S58 responds to breathing at both ends. Our downpipes open up the turbochargers' exhaust side, the G8X mid-pipe replaces the factory resonator section, and the cold-air intake feeds the front.

It is a 3.0-liter twin-turbocharged inline-six making 503 horsepower and 479 lb-ft in Competition trim, with each mono-scroll turbo fed by its own bank of three cylinders and a 7,200 rpm redline.