Thank you everyone for all your help and useful advice. Yesterday I pulled over to check the temp of my gas tank and car underbody, and became uncomfortable with how warm everything was getting. Thus the rear middle section of the pan covering the gas tank came off. When I got home, the middle section and engine section were also removed. I have driven three trips in this configuration, and I have already noticed a 10% hit in MPG as compared to the same trips driven yesterday or in the past week. Note that my front fascia/splitter is already as low as the underbody, thus I already have an air dam.
It is time to scrap my initial plan completely, and focus on BellyPan 2.0. My front most piece on the nose and rearmost piece behind the muffler will stay unchanged for now. I hope to modify and mainly reuse the pan section that goes under the engine bay. On the middle section, I plan to have completely separate left and right pans, and leave the area around the exhaust completely exposed initially. I may go back and add screen or mesh covering, but just to get something back functionally I will focus on getting the sides back together and hopefully my MPG back up. I will also focus on version 2.0 on better integration of the edges to the car’s body.
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