The LX engine sucks. Its what I have.

Basiclly, all you can easily do to the engine is get an intake. The LX's header has the cat right next to it, so changing the headers requires moddification to the exhaust piping, and vise versa. But there are a *few* companys that sell LX ehxausts.

Heres what you do:

If you want to go N/A (normal aspiration, no turbo/supercharger), get either a b16 (out of the civic SIR) or get a b18c1 (out of the Integra GSR). Those will get you moving quick.

If you want to go FI (forced induction), get yourself a B18b (out of the integra LS). Those engines can take boost like a bat out of hell. I've seen some people on Honda-Tech talk about putting 3.5 psi into those engines and getting 200 horsepower out of it, so its definatly worth looking into.

I dunno, the best advice I can give you is to waste your money on the things that matter first. Then work on the minor consmetics and whatnot.