The 4 Series is what BMW calls the coupe version of the 3 Series, since it's debut in 2013. It's available as a Coupe, Convertible, and four-door 'Gran Coupe'. The coupe and convertible are available in high-performance M4 guise. The coupe version was the best-looking car BMW made until the debut of the 8 Series.
The 4 Series Gran Coupe is the sedan version of the coupe version of the 3 Series sedan. Simple, no?
by IntrepidWesterner April 15, 2018