The M4 CSL is the most cranked-to-eleven version of BMW’s M4 sports coupe the company could make. Its 3.0-liter twin-turbocharged straight-six boasts 40 more horsepower than the already-intense M4 Competition, for a total of 543 horsepower and 479 pound-feet of torque. 40 horsepower, however, is only a small part of the story; what makes the CSL so absurdly intense is its single-minded obsession with the track day, bro.
To prep the M4 for apex-taming, the CSL drops 240 pounds off the M4 Competition’s curb weight. It does this by disposing of the rear seats, the automatic climate control, and some 33 pounds of sound-deadening material; further weight is shed by swapping the front seats for full carbon-fiber buckets, a carbon-fiber-reinforced-plastic roof, trunk, and hood, lightweight forged alloy wheels, carbon-ceramic brakes, and a titanium exhaust silencer. If you need further proof of its track-minded focus, one of the only additions offered on the M4 CSL over its tamer brethren is a helmet carrier.