For German car fans, Porsche so defined endurance motorsports that BMWs serious efforts in the late 1970s and early 1980s often go overlooked. But if you really wanted to go racing with the big boys in the 1980s and the premium rides from Zuffenhausen were out of your reach, you might just have looked towards March engineering for the solution. March was cutting edge then, a staple in the 1970s F1 scene with some unorthodox designs. With the new prototype categories in the 1980s, March produced a series of prototypes that were developed out of a customer BMW M1 that March modified. After some development, the March 83G and later 86G proved not particularly competitive to the much more highly developed 956/962s, but did win the 1984 Daytona 24hrs with Andial Porsche power. BMW also signed up with March for a run at IMSA GTP with a development of the 320i Turbo Group 5 and Formula 1 engine producing up to a reported 800 horsepower. In qualifying trim for Formula 1, these M12/13 motors could twist around 1,400 horsepower out of that small displacement. With Formula 1 and sports car racing legends David Hobbs and John Watson amongst the ranks of drivers, it looked like a sure bet for some wins. It was for naught, though, as Porsche and later Nissan and Toyota dominated IMSA into the 1990s. BMWs efforts are nearly forgotten, and that spells value in the used prototype market today: