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You're definitely on to something here...
We know from numerous discussions on car-body/road-surface interactions, that the air flow under the car does not go straight from the front to the back.
And like your observation, the air flow tries to squeeze out sideways due to pressure-expansion when entering the under-body space.
Someone could spend a great deal of time trying to understand exactly what the air flow looks like, and then design parts to work with that flow.
Jim.
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