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Old 01-01-2010, 10:48 AM   #5
Rogue Leader
Iatefiberglassinsulation
 
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Drives: 2010 Camaro 2SS M6
Join Date: Oct 2008
Location: Long Island
Posts: 3,601
a Spoiler "spoils" unnatural air movement over a car thats moving.

A diffuser... i don't know why its called that but you can say it diffuses the high speed air coming from under your car back into the atmosphere which is standing still, this creates a suction effect for downforce.
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