[Christien]

I spent a day at Mosport with a bone stock C6. Awful. You'll never see top speed if the turn at the end of the straight requires anything less than 120mph entry speed, because the brakes can't handle it. The steering is light but overly responsive and jittery. No grip with the stock tires, whatever POS they are.

HOWEVER...

The choice for track-prepping is the C6, because you replace so much, that there's no point in buying the Z06 (which incidentally is a MUCH better car on the track, stock). My dad's looking at prepping a vette and everyone he's spoken to so far advises starting with the C6 and going from there.