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I cant say if i saw a gain i added the air dam shortly after i bought the car and the nut behind the wheel was quite loose...and i did no testing to see what it improved. I can tell you as a single mod i have seen the most out of is smooth coroplast wheel covers over my stock steel wheels. To be fair my underside is a lot cleaner than your stang as there is no drive shaft or rear axle causing drag
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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