there is not really a limit o nhow much you can put into your car, it all depends on what you want to achieve.
Check out
http://board.tercelonline.com youll find answers to lots of questions there, best tercel resource on the web.
there are alot of OEM toyota sites on the web for erplacement parts, just do a google search,
and ebay always has lots-a-crap for cels and everything else, weed through, and you can find some goods deals on some good parts
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1992 Tercel DX
JDM 5EFHE, SRI, ACIS, 4-2-1 headers, 2" exhaust, Magnaflow Hi-Flow CAT