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mmmmm. Grand Prix's have parachutes for rear bumbers. My SE has about 8-9" of just plastic hanging out, that can catch air off the rear subframe. The GT and GTP have over a foot of plastic that hangs down. There is nothing to stop air from trapping, and those that do race their GTP's have shown a few tenths or more dropped in the 1/4 by sealing it up.
I wouldn't cut holes, I'd seal it. Ya spent all that money on the car, why butcher it?
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