hmmmmm well on a pitiful income you porbably best finding a new hobby, because cars cost money. in saying that though, there's been heaps of discussion on mods for the humble taxi motor all over the internut.
rockers will be a great addition to any engine, but don't expect a quarter mile monster. if you're not replacing cam then go for 1.8-1.9:1 rockers. there are a few manufacturers, and yalla terra are a site sponsor here and have a section devoted to their products near the top of the main page.
undercar system, do you mean an exhaust? if you do, then go for a full exhaust (headers and catback) go for 2.5inch catback and pretty much whichever headers you like (some are better than others, but I won't go into that detail) a highflow cat isn't really necessary unless you have a highly potent ride - stock will be fine (or you could use cats of an LS1).
your car should already have a CAI, but an additional unit could be of benefit. best idea is to look at the yalla terra unit, or you could construct your own from a length of 3inch convolute tube
like I said, the mods you want are covered in MASSIVE detail over this forum, so have a look around at what you like. my info is just a nuts-and-bolts rundown
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