I agree with Pantera...
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I do know that there is a point that the wind resistance overcomes the horsepower you have and you just can't go any faster. There used to be a top end speed list of the top sportscars in one of the car magazines and none of them were over or even at 200. It has been years since I kept up with the list so I am sure that they have raised the top with some of the cars that have comeout since. I would beleive 175 to 180 with a stock body vette but they are not that stable at that speed.
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Please see the link below for an interesting discussion on this very subject.
Z06 Corvette Top Speed
Pretty interesting reading about Chevrolets 'race Vette for the street'
Bruce