It's not unusual to see a new car, camo-covered and mysterious ... testing the next-generation Camaro alongside pristine third-gen models (really, they are damn clean examples of the breed).
In 1990 the IROC-Z package was the pinnacle of performance for the third-generation Camaro ... racing, and it took an informed dealer or buyer to know how to order it for a street car.
but the fifth- and sixth-generation Camaro-based COPOs are designed for track use only. A few enterprising gearheads have managed to get these modern race cars licensed for street use, though.