You already know about the M1. It's that Seventies race car that BMW built because it was annoyed with Porsche because the 911 kept winning everything. The same car that was actually made of plastic, vastly expensive and took so long to reach the road that, by the time it surfaced, it wasn't eligible for the races it was built to compete in.

What you didn't know is that, actually, it did manage to compete in a little known American series called the BMW M1 Procar Championship - a single-model series created, presumably, to do something with all those surplus racers. And the car you're looking at is number 31 of 40 cars destined to swap paint on the track.

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Thing is, this 1979 model, a standby car that never actually made it to the races, was preserved and used as a road car. It's just been restored - complete with original Procar spec and an MOT (well, the American equivalent) and it's up for sale with collector car dealer Canepa.

The listing says, "The goal was to use as many original Procar parts as possible. It's now fitted with Procar suspension uprights, hubs, control arms, tie rods, axles, mirrors, and that amazing Procar body kit and rear wing. Original Procar centre lock BBS wheels were sourced, the centres crack checked, and then rebuilt with new 17 inch rim halves. The front wheels are 10 inch wide running 265/40 ZR 17 Michelin Pilot Sports, the rear wheels are 12.5-in wide running 335/35 ZR 17 Michelin Pilot Sports."

We're told it's strictly price on application, but we can't imagine this'll stay around for long whatever it's up for. Form an orderly queue, gentlemen.