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Random thoughts, not well organized:
Bug deflectors are generally good for creating little vortexes all along them, and not generally good for MPG. Remember, the front of the car doesn't contribute that much to the drag; the rear is where the real improvements come. (Not 100% true, but for most cars made in the 80s and later it's true enough.)
Anything you can do that will create downforce will also create drag. The real trick for race car developers is to create "enough" downforce without creating "too much" drag, and the real art is in determining where those tradeoffs are and how much is enough and too much.
Anything you do that opens up the back of the passenger compartment of the CRX is going to suck the exhaust into the cabin. Don't do that.
You might be able to get some drag reduction out of something that looks like a diffuser but is too shallow to really act as one.
You might try some cardboard or coroplast to get the hatch up to the line of the template. Do coast-down testing (ABA testing) to see if it helps.
A race car is not a street car. Most things that work on race cars are useless on street cars. That "superbird" wing on the Celica is most likely just for show.
-soD
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