I know this has been answered about 300 times since i came on the board. Not to sound like an ass but search through the "engine modifications" threads and see if you can find anything. I don´t know much about the LX otherwise I´d be more help to you.
first remove your air silencer tubing which is all the plastic junk underneath the airbox (just unscrew bolts and pull the tubing out), then 1 of two options: get a K&N stock sized air filter - lifetime usage, a little more air for yer car to breathe, or go for the whole cone intake thing.
Excellent/CHEAP mod for pwr. Only gave me a couple horses, but noticeable improvement in over 3000 RPM powerband. On a STOCK 94 LX sedan, it´s almost as much pull as if you have no cat-back exhaust...almost.