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Ville80 -
Welcome to EM! When I look at the rear slope to your Maxima's roof, it looks closer to the "good aero" rule of "no more than 15 degrees" than other sedans.
Regarding the polycarbonate, I am going to assume it is as flexible as coroplast. A lot of people use cardboard to perfect a template and test the mod. I keep thinking you could use some strategic zip ties to attach it. The virtue would be easy-off if there is an overheat issue (not likely based on the upper grill). If the plastic does have to flex, the bumper *appears* to be a shallow-angled curve to me.
CarloSW2
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