BMW M550d vs Audi A7 BiTurbo 0-250 km/h Sprint Race
4 Oct 2013, 13:43 UTC · By: Gabriel Nica / The most powerful inline 6-cylinder 3-liter diesel engine in the world can now be found on the BMW M550d xDrive model, the BMW F15 X5 M50d and the BMW E71 X6 M50d. We're talking about the N57S ...