With a few minutes and simple tools, you can make your car sound terrible. Automakers rarely devote time and effort to tune a perfect exhaust note, so here is the 2021 BMW M3 & M4 exhaust system explained. Forced-induction cars (turbo or supercharged) make the most power and torque with open exhaust. Your neighbors and the law would not abide by such a soundtrack, so the engineers at BMW M started from scratch.
With a goal of supporting 510 horsepower in the M3 and M4 Competition models, they stepped up to dual 2.75″ pipes. A meaty resonator includes a crossover that is tuned to eliminate rasp and drone produced by feeding each turbo by a different set of three cylinders. They even went so far as to transition to oval pipes near the differential to preserve ground clearance. This is just one way BMW M builds the ultimate driving machine, so check out their cooling system here.
Image (C) BMW A.G.