Remember the BMW M8? Of course you don't. The German automaker never produced it. Correction: It did make the M8 - emphasis on "the." One exists in a BMW facility in the German city of Garching as a mock-up of a model nearly set for mass sales.

The 850CSi, which did see the light of customer garages, is a hell of a machine with its 380-horsepower V12. In comparison, the M8 makes it look plain, both visually and statistically.

Read the rest on the 5Series homepage.