In my experiance the downforce actually pulls the car down closer to the road, my Towncar only had 4" clearance under the center of the car and at slow speeds would not scrape on anything but the steepest driveways. Going dowm the highways @ 70 it would scrape on the center of the road with the slightest dip, where @45 over the same dip no rubbing. Our roads have grooves in them from studded tires and 90-100,000lb semis.
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