Quote:
Originally Posted by E.Roy
My guess on this is that the underbody becomes less important to be smooth if you put a lower air dam on the car to make air go around the car instead of forcing it underneath.
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That is true, but the ideal solution is a smooth belly pan front to rear. An air dam increases the frontal area of the vehicle. If it does divert air away from under the car it can increase efficiency, but a full belly pan will be more efficient.