Good point and a real concern if the VIN rule is the only thing that keeps one from using a say 92 camshaft in a 87 motor to make more power.

But still, cheating is cheating, right? If the spec line says 1988 Borgwald GT with 11" rotors, 5 speed transmission, and 9L V8 then that is the only year they can get those components from, including the chassis, correct? Anything else would be illegal.

Ron