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One areo mod I do not see on here yet are 6-10 large 3 to 4 inch holes being drilled in the rear bumper cover. I know in our world having a full belly pan and or boat tail is ideal, but this might be benifitial too. I was told the rear bumper to many cars act as a parachute, traps air, and creates drag. I would guess it is a cheap way to let air escape or flow through the rear bumper.
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I was planning to do that on my old car (Barina aka Metro) but i sold the car before i got around to it, i wondered why it wasnt more common on here, just because its not as effective as a belly pan or are there other reasons?