The BMW M4 is a high-performances version of the 4 Series automobile developed by BMW's in-house motorsport division, the BMW M GmbH, the M4 is one of the Fastest M cars ever produced by BMW achieving 0-100km (0-62m) in just 4 seconds. Part of the renumbering that BMW splits the 3 Series coupe and convertible models to the 4 Series (to further differentiate with the 3 Series sedans), Wikipedia