2015 BMW M4

The M4 designation was new in the US for the 2015 model year at BMW. No longer would there be two- and four-door 3-series cars. Now the 4-series would be the name for the two-doors and their four-door siblings would retain the 3-series moniker... unless they had fastback hatches in which case they were "Gran Coupes" and badged as a 4-series. BMW's naming was getting a little incoherent if you ask…