Alex - He was saying that neither the VG's nor the wing will help with aero on that car. The VG's actually increase drag by an increase in Cd and A, but help overall because of the function they perform. They need to be employed on a much smaller scale to help out on a car, though, especially considering the Corvette already has a nearly ideal rear slope.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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