The BMW 4 Series is a range of coupe, convertible and fastback models manufactured by the German automaker BMW since 2013. It was unveiled at the North American International Auto Show in January 2013 in Detroit. The 4 Series was created when BMW spun off the 3 Series 2-door models into a separate series. In 2014, the 4 Series Gran Coupe 4-door fastback body style was added to the range. It was launched in mid-2013 as the successor to the fifth-generation 3 Series range. The body styles of the range are 2-door coupe, 2-door convertible and 4-door fastback coupe (marketed as "4 Series Gran Coupe"). As per the 3 Series range, it is powered by turbocharged petrol and diesel engines with 3 cylinders (petrol only), 4 cylinders and 6 cylinders. The M4 models were introduced in 2014. They are powered by the S55 turbocharged straight-six engine.