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The wheel skirts are attached at 3 points - top and each bottom side (fore and aft). They are attached to small aluminum "L" brackets that are attached to the wheel well with small self-tapping screws. The reinforcement aluminum bar at the bottom is there to push the coroplast out into shape, preventing it from brushing against the tires - the wheel covers did not fit under here, so I'm just using raw steelies. (I may later opt for smooth covers). The coroplast does not deliberately attach to that alumnium reinforcement/shaping bar at all - only at the fore and aft attachment points.
An update on the other components: I've seen temperatures in the intake no more than 150, but usually 140F. With all of these modifications, I've seen SIGNIFICANT improvements in FE. Look at my logs, but I think it jumped up from ~42 to ~50, which has reached my goal already - surpassing 50 normal driving.
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