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Old 03-16-2012, 10:54 PM   #8 (permalink)
bikin' Ed
Master EcoModder
 
Join Date: Jul 2008
Location: Tallmadge, OH
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splitter / lip

The lip at the bottom helps to catch air being forced down from the bumper. It directs it around the side of the car rather than letting it go underneath. That keeps you more aero.
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