Originally Posted by RLHMARINES
I think the rear end design was already set because both models are the same with the exception of the as yet released wing and the rear diffuser and tail light with top cross overs. The hard parts such as the bumper profile is the same as production.
Thats why I think its an intermediate design. It doesn't look like the final version, but there are elements there which have been changed from the Concept but are featured on the production car. I just don't see GM going and changing the rear fascia and relocating the backup lights for the Z28.