May 24, · A Modest Facelift for The BMW M4 is the high-performance variant of the 4 Series. The BMW M4 carries over with only minor changes. The stylish BMW M4 is the two-door version of the M3 sedan and is based on the BMW 4 Series. The 4 Series consists of a coupe, a convertible with a retractable hardtop, and a Gran Coupe sedan, but only the coupe and convertible are available as M models.