I would do full belly pan and maybe some spats for the front and rear wheels. Get some Carbon Creations GT-C mirrors if you can find them and tolerate them (maybe delete the passenger side one if you can). I would say aero on the top of the car would be decent. If you have louvers, remove them as it may affect the ability of air to stay attached as long as possible. The sides where the air separates at the back I'd put one air tab on each side half way up to the top of the trunk. Maybe an underbody diffuser at the back after that and I see someone's done it.
For other ideas on efficiency, get some lightweight flow formed/rotary forged wheels and low rolling resistance rubber - I love Nokians. Do the electric fan mod (volvo 2 speed controller, bmw 2 speed sensor, a relay, some wiring and a 2 speed Taurus/TBird fan). Find aluminum drive shafts if you can. Again for lower rotational mass. Run low viscosity synthetics and use ws2 and nmf wherever you can.
Always have fun!
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