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Haha, I've answered that question on almost every forum I've posted on. The answer is that tucking the belly pan up and under the bumper cover lip will do next to nothing for aerodynamics. The coroplast is right around 1/8" thick and small bumps like that in a body have very little effect on aero.
The rear two mounting points are push pin type fasteners. I haven't got around to getting them for the front yet.
I also haven't gotten around to doing any testing with it to see what kind of benefits it is providing. As of right now I'm averaging just over 40 (click my sig pic to see my mileage log).
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