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I ran 158. My tuner was correct in that he said +100hp is about 10 mph in the 1/2 mile. There was a stock zl1 that ran 147.
Conditions were real hot and muggy. About 90-95 and humid. I did race a Shelby GT500 with 700 horse and he was disappointed that he ran same speed last year with 110 less hp. He said temps were 20+ cooler last year so speeds got to be higher in better conditions.
He also got a good look at the backend of a ZL1!��
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