I've seen some car designs that were based heavily on airfoils (particularly those designed for ultra-efficiency): I'm curious if you based a cars contours on a negative incidence wing made it as wide as the law would allow (92 inches) and used a radiator type system like you'd see on combat planes in WW2 (trying to exploit the meredith effect with side or top-scoops and exhaust pipes to help pump the duct)