Carrera Supercup cars how close to road car performance?

[Welshbeef]

I always catch these races before F1 really enjoy them it's a great series lovely sound and fantastically close.

Anyway excluding the slicks and mega aero how different are these cars to the careers 2? Or should it be how close to the GT3 - RS?

I really want one even if it's "only" a 996 gt3 rs