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All I can say is that my aero gained me about 2 seconds at a twisty, slightly sub-2min track. This was with the same tires, but different damper settings.
The car weighed about 3700 with me in it and a full tank. That is quite substantial in my opinion. The same downforce on a lighter car with the same power to weight (and close drag) would no doubt be more effective though.
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E90M 6MT Slicktop Single Humper in need of a diet
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