well the car already has fresh air vents in the rear lower 1/4s to let air out, or at least i think it does, so is a roof scoop not the obvious solution to your problems ?
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99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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