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There was a spoiler available for the 2nd-gen cars that was pretty much just that, in a rather small form. I think it was available as an option on some JDM or European market CRXes. I always liked the way it looked, but I never looked hard enough to find one for my own Rex.
If it sticks out straight, it will soon wind up "outside the template" and be similar to a spoiler that sticks straight up. If you can get the spoiler to extend out to the template, that should help a little. But you'll have problems created by the sides of the spoiler--vortexes and such, creating turbulence. I'm not sure if there is more of a gain than a loss for that.
Note that the CRX uses a Kamm-back style. It has an abrupt truncation to try to get air flow to separate after flowing over the top (and sides) of the car. You still get a turbulent wake, but hopefully less drag than with a more gradual transition to the back.
The best improvement would be to make a full boat-tail along the "template" lines. Or to make a partial boat-tail and cut it abruptly--sort of like the current design, but further out.
I never did make changes to my CRX. It was far too nice to chop up like that, and I liked it for what it was rather than what it could become.
-soD
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