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I'm curious what others are doing; especially for the upper rear section of the car. Sloping the rear end like the CRX would be nice but that's more work I want to do and would permanently "ruin" the car; preventing it from competing in specific race classes.
Right now, one thing I thought about is replacing the side windows with Lexan, and NACA ducts the expel air to the rear; probably through lexan rear windows. For the bottom though, would it be best to run a low diffuser or have it come up(bumper cut to allow air to exit higher)? Exhaust dumps in the middle so that's not an issue.
Engine is not a concern. It has already been swapped to another D-series motor(JDM D15B VTEC), and is currently being built(13.5:1CR, ITBs, short DOHC ZC trans. w/1st gear+ZXi FD+LSD, Bisimoto header+valvetrain, etc.). Power goal is +170whp which should be plenty.
I actually got ~57mpg highway with the car and a unknown-brand camshaft in the D15B VTEC along with a short transmission(DOHC ZC with Si 4.25 FD); I cruised in 5th at 4000rpm(about 70mph).
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