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the aim is to get the air to flow quickly under the car, thus reduceing its presure. so as flat, leval and clean a underside as you can get will help. also deeper running boards to stop the air under the car spilling out at the sides.
the other option is to stop as much air as possable getting under the car but this can cause a lot of turbolance at the rear of the car creating a lot of drag.
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