Uhg please don't cut the springs. The ride quality will be absolutely terrible. The bafoon I bought my Miata from did that and it was awful. I understand I'm cutting down all of your ideas, I'm just trying to help.
A front air dam will have the same effect as lowering it, without the ride quality change.
Also removing your side mirrors (if legal) or swapping them with tiny motorcycle ones will also be fruitful.
A warm air intake would also be advised, but be careful because timing advance + hotter intake temps = pinging. It's a game of balance.
Rear wheel skirts would also be a cheap, effective way to boost some FE.
Swapping to 14 inch rims (insight or civic HX rims specifically) on Re92's will also help. (if they will fit).
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