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Ah ha. So my technical concept of the diffuser purpose was off just a bit. But I still stand by my recommendations.
The picture you posted here and each example on the wiki page all show straight fins, directly parallel to the main axis of the vehicle. They also ALL come up at an angle from the under-body to the rear of the car. This vertical angle is what provides the de-pressurization of the air moving under the vehicle.
So you are hoping to lower the pressure of this air by allowing it to expand horizontally. But if you conceptualize the air flow coming toward this panel, you are actually forcing some of it to turn when it hits the inner fins and is re-directed outwards. While it may leave the diffuser panel at a lower mean pressure, you could actually raise the pressure locally where the air is forced to turn.
And if you add fins extending further down that any other piece under the car, you are effectively adding frontal area, especially when they are cocked at an angle like that.
Is there no room under a civic rear end for some vertical angle? I have even contemplated cutting up my rear bumper somewhat to gain more angle and build one of these myself.
In any case, yes, they do look frickin sweet. What materials / construction methods are thinking of employing?
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