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parachute
If the bottom of the bumper is no lower than the bottom of the spare tire well or trunk floor,it may not be catching any air at all.If the bottom is level with the trunk floor,it is probably reducing drag as it is,as was discovered in the development of the Subaru XT,with Cd 0.29.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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