Whenever you increase downforce (or just reduce lift) your more than likely going to increase drag. You're essentially pushing the vehicle downward and increasing it's resistance to forward motion.

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2007 Deep GXP - M5, Loaded w/o OnStar
Mods: JPM Custom Shifter - Stubby Ant - WindRestrictor - Dejon TB Elbow - Dejon BOV Spring - JPM Center Console - JPM Visor Covers - Wester's Tune
Future Mods: delayed due to European Vacation!!

NASSOA Founding Member