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Depends..........does your Corvette have stock (or close to stock) horsepower?
The reason I asked is that my stock 04 Z06 ran within 1mph of 163mph every single lap (9 or 10 runs), regardless of who was driving, whether or not we taped it up, or ran with or without mirrors........SO, unless you are running over 180 (say 200 club?) I don't think that it matters.
HOWEVER, weather and wind speed and direction matter ALOT!
Next day ALL Z06s (C5 and C6) ran about 5 to 8mph faster....but all within the same speed range.