When people think of McLaren, their minds usually jump to Formula 1 or mid-engine supercars like the F1 and 720S. But back in 1980, McLaren Engines in Michigan helped Ford build one of the strangest and rarest pony cars ever to wear a Mustang badge. Ford wanted to shake up its performance image as the muscle car era faded, and McLaren lent real racing credibility. The result was the M81 McLaren...