Your lower grill opening is a little smaller than mine -- you definitely could see an improvement in temperature by blocking the "chin" area.
The issue I had with the rear belly pan was air flowing above the rear beam axle, and pushing the Coroplast down. It should be "sealed" up at the front and sides so this doesn't happen.
Do your wheel covers "creak" when you drive slowly? You may need to "tack" glue them in place -- mine started to fall off (on the right side) after about a year or so. The spring "fingers" weaken after a while.
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