The GT3 and Carrera Cup car are the same animal and only vary depending on what championship they contest.
1: In one make Carrera Cup national races they use Michelin tyres and steel brakes.
2: In the Porsche SuperCup they use the same Michelin tyres but also ceramic brakes.
3: In open make GT3 races they use steel brakes and whatever the spec tyre is for that championship. e.g. Avons in BGT which are about 2 secs a lap slower than the Michelins.
The RSR model as used in the LMS/ALMS looks similar but runs to GT2 regs and is a totally different animal.
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