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It occurs to me that anyone who could afford this car could easily afford an hour of wind tunnel time and two scraps of coroplast to make plugs for the vents. Nobody else really needs to care.
Viturro -- All this thinking about high/low pressure/velocity makes my head hurt. With no more education than following threads here for a few months, I've come to look at it this way. The air and ground plane don't move, the car does. The air only tries to regain an even distribution of the ambient pressure, and it does it according to certain rules.
Aerodynamic features that work inside a pipe (Venturi effect) also work on the outside, it's equivalent to a pipe of arbitrarily large diameter. A vehicle could be considered an inside out musical instrument, with the goal to mute it as much as possible.
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If/when I don't have a working spedometer I can tell 45mph because the exhaust is the same note that Johnny Cash hums as the first note of I Walk The LIne.
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You get fluttering areas of high and low pressure (always in turbulence at ground level) that are subsonic noise (not always subsonic—I'm looking at you, driver's door mirror), which provides a medium for vortexes. Kind of like regular weather can cause tornadoes.
Coaxing the air to part gently with minimal lateral acceleration, and then to refill the wake without [insert word for rotation around direction of travel] movement, which causes vortexes, is the goal.
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