They had a works corvette driver drive one stock to a sub 1.30 lap at road atlanta which is nuts for a stock production car, I think regular GT cars run about 1.28's:
https://www.youtube.com/watch?v=VmrPPBrZZ7c
I drove a regular C7 Z51 a few laps at a track and it was unreal i was riding in a C6 that morning and it was light years ahead.