Great news about the GT.... don't let this get lost in the discussion: (Note that they tested a BASE C6 with the Z51 option, they're not even talking about the C6-Z06!

"There were several surprises in this class—and the biggest was the astonishing performance of the base Corvette equipped with the Z51 package. The Vette was a returnee to VIR because we experienced a data problem with its quickest lap last year. We had to publish its second-quickest lap time (3:09.3) then, which we didn’t think represented the car’s capabilities.

Those suspicions were dead on, because this time around the Z51 blazed around the course in 3:03.6, nearly six seconds quicker. That time bests those of the Audi R8 and Porsche 911 Turbo, cars that cost more than twice as much as the Z51’s base price"

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