Carlos from Spain:

 I wonder if in the case of the 911 Turbo they measure the Cd with the wing up or down Smiley


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 That is a very good question! Comparing the 997TT and the GT2 at high/very high speeds on the AB I am even more impressed by the performance delta given these CdxA numbers (also keeping in mind that the gearing is longer in case of the GT2)... The GT2 delivers amazing performance.