why not CURVE AND TAPER the air dam?
maybe have it higher in the middle, which would be at front of car, and it could curve back and get lower as it gets close to the wheels. that way you still get some air under the car, driveway clearance, and low air dam in front of wheels(is that kind of like a wheel spat?).
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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