Welcome to HAN :thumbup:

There is always the basic intake/exhaust/header to get 15-20 or so horses out of the engine in addition to making it sound better, but the better route over time is to just save up money for a new engine (2-3 grand installed for a really nice engine like an H22A). The grand or so you'll lay down on I/H/E will be much better spent on saving for a nice DOHC VTEC engine with a 5-speed transmission. This, of course, if you plan on keeping your car for awhile and really like it.