Herbert Diess, research and development head at BMW stands next to the new M4 coupe as he introduces the automaker's new lineup at the North American International Auto Show in Detroit, Monday, Jan. 13, 2014. (AP Photo/Carlos Osorio)
The BMW M4 coupe is unveiled at the North American International Auto Show in Detroit, Monday, Jan. 13, 2014. (AP Photo/Carlos Osorio)
The BMW M235i is unveiled at the North American International Auto Show in Detroit, Monday, Jan. 13, 2014. (AP Photo/Carlos Osorio)