These days, the Corvette is meant to be a 911 rival, with the ZR1 taking on the Turbo and the Z06 taking on the Carrera. These are therefore the only Corvettes that matter, and Chevrolet
has taken to treating the Grand Sport with a sort of distain. It is built only out of a sense of obligation to provide an inexpensive model, and is obviously and conspicuously made worse in order to keep Z06 and ZR1 buyers from wondering what they paid all that extra money for. The TT RS is based on the same platform as the VW Golf, and Audi put a lot of effort into making it extra special, also to keep customers from wondering what they're paying extra for.