A supercar does not have to be a COPO ordered car if it is dealer modified...Ala Baldwin-Motion. Most if not all Motion cars were RPO ordered cars from GM, but were heavily modified from there, similar to the newer cars you're talking about. If an RPO ordered 435hp Corvette (the car mentioned in the original question) was modified at Motion, Yenko, etc. then it WOULD be considered a Supercar, even though it was not a COPO. This topic is as simple to some/difficult to others as the "what is a rebody" thread.
