Yes, ZR1 was impressive at the 'ring...

[slngsht]

But the Z06 is just a tad slower. 7:22

http://www.autoblog.com/2011/06/23/2012-chevrolet-corvette-z06-laps-the-ring-in-7-22-68-shaves-20/#continued

 

It "only" reached 170 where ZR1 peaked at 183.

 

As I was watching it, I'd look at the speed through some of the moderate corners and realize the guy is doing 140. Yikes!