You need to view the car through the correct filter. It's better suited to the track than 90% of the street cars in the game already. For the GRC it looks like the issue is a rear diff that overheats. That's no different than the Focus RS. And is considerably better than the CTR with it's engine overheating issues (not to mention shredding it's front tires).
I've had a deposit down for a Circuit Edition for 15 months at this point (and I'm #1 on the dealer list). So annoying. FYI the brakes are identical across all trim variations. Only difference on the Circuit or Morizo is the calipers are painted red. (Big whoop). Same brakes, however, are considerably larger than what you'll find on a Golf R and a bit larger than that of a CTR. Bigger than a 370Z, bigger than a Mustang GT, etc etc etc.