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I think you would be better off going with ground effects under the car, tapered slots that grow in width and dept to the back of the car, they create downforce from the descreased pressure, but you could make them to be reversed or something, I dont think you would encounter lift, not at 55mph, and it could jettison some higher pressure air into that rear area. or, cut pressure vent holes in the top of your rear bumper, which would do something very similar
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