The company Alpina in Buchloe developed based on the 8er the Alpina B12. The B12 was from 1990 to 1994 based on the 850i with the V12 Higher power and 257 kW (349 hp) and automatic transmissions built. Since 1992 was the final hand-B12 5.7 is available, a version of the 850CSi larger V12 and 306 kW (416 hp). Both vehicles are not the usual BMW at 250 km / h abgeregelt, the maximum speed is at 280 or 300 km / h. From B12 5.0, 97 pieces, from the B12 5.7 57 units.

From sports model M8 was only around 1990 a prototype was built. He had no headlights and was, according to the statement of a former BMW technician only "loosely screwed together." Other sources also speak of the three vehicles, one of which rides for testing was lost. The M8 is one of the biggest secrets of BMW. The prototype is in the so-called "poison cabinet", a BMW warehouse in Dingolfing - allegedly stacking box - entered his. Buyers due to lack of technical problems and was never a production starts.

The engine of the M8 would be up to 440 kW (600 hp) strong 6-liter V12 engine based on the S70 have been, then ultimately in altered form its place in the McLaren F1 super sports car has found. Also the engine of the 850CSi (moreover, in a vehicle as M8 indicated) based on the S70 engine, but with 5.6 liter displacement and 280 kW (380 hp).