It was supposed to be the best all-American supercar in the world. Instead, punters said it was 'the worst car in the world.' ...

An American-built supercar once topped 200 mph and challenged Europe’s elite, yet barely anyone remembers it today.

Vector only built 14 of these Diablo-based, V-12-powered M12s. Now, there's one for sale. Grab it while you can. Defunct American supercar maker Vector is best-known for its first car, the W8.