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None of this will matter at legal highway speeds. The change is really negligible, unless you drive between LA and SF or Vegas on a weekly basis in no traffic on cruise control the entire way.
From what I hear, most rear wings and spoilers don't even do anything until above 80mph.
FWIW, BRZ factory has a cd of 0.28, with full STi aero parts and underbody panels, it gets lowered to 0.27, same as a VW Passat Wagon! LOL
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'14 BRZ LTD MT DGM
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