Welcome. Thanks for lurking.
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has anyone done any real testing on redirecting air from high pressure areas (like wheel openings or under the car) and introducing it directly into the "parachute" of drag, effectively relieving the "suction", and increasing the airs ability to simply flow off the cars roof line or trunk?
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Yes. aerohead has been at it since 1972.
The wake isn't like a parachute, it's like creeping fingers. Wheel wells are not a good source of high-pressure air, only the stagnation point.
Thanks for putting 'suction' in quotes. Air has simultaneously a pressure and a velocity.