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Stated slightly differently:
This will make more sense at highway speeds. I suspect that this effect happens to some extent to people using full undertrays already anyway, as some air gets forced down the chassis tunnel because of it not being able to then go elsewhere.
Now, since we all need to use some incoming air to cool the radiator and that air will be at a higher pressure and need to go somewhere, would it not make sense to duct this slightly higher pressure (and warmer) air to the rear without adding to the frontal area.
I'm inclined to agree with Frank, but then again, I don't now how much air this ram effect will be able to send to the back of the vehicle without necessarily adding to wind load.
Pardon, I couldn't remember the thread, but someone posted a CFD profile of their Mk4 Jetta and just for fun, poked a hole through it and the drag at the rear of the vehicle dropped dramatically and I started wondering what something like this would look like in practice on a vehicle used daily (not some special Bonneville racer or similar).
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