I'll get a shot of my speedo going full out when I get my new wheels on so you can compare it to the z06...
Stiff competition though...
Here's my Stillen SC car with my Daily drive 20" Vossens CV2's @9psi (Beautiful, but not the lightest things in the world) Not redlining it either, which I guess I should be considering thats when the SC makes most power.
I receive my new "track" wheels tomorrow...hopefully I can get a video sometime this week if I manage to get them mounted. I know the current ones are definitely slowing me down a good bit.