The M1 was BMW's first attempt at a supercar, and by any measure, it was a success. On the street or the track, the M1 combined performance, drivability, and comfort in an age when supercars were known as uncomfortable, finicky machines. This 1979 M1 was purchased from the original owner by racing driver and journalist Harald Ertl in 1981 and heavily modified in collaboration with British Petroleum for top speed record runs. The car was outfitted with twin turbochargers and body modifications, making 410 horsepower and hitting a record 187 MPH. Just a year later, Ertl died in a plane crash, marking the end of a career that spanned five years in Formula One and touring cars. Recently rediscovered in a London garage, this is the first time Ertl's M1 has traded hands since the early 90s and is offered in as-found condition.