Sounds right for the factory tire size. The factory is full of comprimise. I think the reason they raise the center is to maintain the center ground clearance. Straight across I think would be easier and more effective.As far as hot rod magizine says for air dams they also spent wind tunnel time testing go as low as you can without ripping it off the truck. The other school of thought is go as low as the lowest part of the suspension to lessen frontal area.
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