[Unreal]

Maybe Tom could give a better definition, than I, but basically Supercars are hot rods that could not be ordered from the factory under RPO. It could be documented dealer conversion or factory built under COPO system. So L-72 Corvettes are not Supercars, while L-72 Camaros, Chevelles, Novas are. This is a great way to differentiate the rank and file muscle cars from the specialty muscle cars.

One exception I recall from SCR4 was a 70 or 71 Z28 with a special spoiler that was ordered under COPO. He was parked with the real Supercars, while a 70 LS6 Chevelle convertible was parked over in the corner.