Compare that to the rear-wheel drive M4's twin-turbo inline-six ... to poke out from the rear bumper. Throwing parts at an ...

Our test M4 Competition convertible blasted to 60 mph in 3.2 seconds before crossing the quarter mile in 11.3 seconds with a trap speed of 122.8 mph.

parts and panels to save weight. BMW says the M4 CS, with intelligent all-wheel drive and 8-speed M Steptronic transmission, can accelerate from 0-to-60 mph in an estimated 3.2 seconds.