where
Zero,over the years,people have put airdams all over the place.
Typically,it's a matter of ground clearance,the ability to survive parking curbs,driveways,and not hang so low,that they increase frontal area enough to cancel benefits do to additional drag.
The ideal would probably be like what NASCAR is running,but they'd never survive the real world unless they could be raised and lowered according to driving environment,like some of the low-drag concept cars.
Mounting them well ahead of the front tires allows the outer ends to be radiused,wrapping around into the rocker panel area such that air coming off the ends of the airdam is more closely matched to that of the air going down the sides of the car,thus,preventing the creation of drag-producing vortices.
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