The only way to determine the effect of the current air dam is through ABA testing.
I would keep the flat rims, and add a cover to the bed.
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AeroCav
Current Mods: Deleted mudflaps, Denso TT plugs, Synthetic blend motor oil
Future: Aero rim covers, air dam, grill block, full synthetic oil, synthetic transmission oil, reas wheel skirts, partial camback
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