The rumors of the BMW 4 Series Coupe to launch at the 2013 Detroit Auto Show are intensifying as a new spy photograph is released on the interwebs with the car almost baring it all near the BMW headquarters in Munich. With almost to camouflage, the side design is revealed which surprisingly features a functional vent. New side mirrors with signal indicators, M Performance brakes, and a small badge indicating that we are looking here at the Sport Line model are also visible in this photograph.
Photo Source: Carscoop