One of the rarest of (relatively) modern BMWs is the M1. Back in the mid-1970s, the gang in Munich were tired of Porsche getting all the glory in sports car racing with its 911-based 934 and 935. BMW decided to design a car specifically to compete in Group 4 and 5 racing against those Porsches, and because Group 4 required that a minimum of 400 road going cars be built for homologation, BMW designed the race car and then changed only what was necessary to make the car acceptable for the street. Unfortunately, by the time they got the 400 cars built, competition was already moving on and few M1s were ever raced.
BMW did build a small run of cars based on the Group 4 spec car for an