turbo timer... bigger turbo... bigger intercooler... bigger injectors... better downpipe... no cat or hi flo one.. better exhaust.. Intake... carbon fiber drive shaft... all 3 quaife lsd's... a bushur built long block... a buschur tranny...
ahhh F it... go here...
http://www.buschurracing.com/parts_catalog.html
seriously though he should be asking these questions on a dsm board... we don't know enough to give you the best list...
the one you have is going to end up with hardly any performance gains....
What gen is it?
*edit*
So I found out it's 2nd gen... My recomendation stays the same get your info from the dsm boards not here... feel free to ask but your not going to get the same quality of responses about a dsm here.
Also stay away from a cold air kit until you upgrade the fuel system (ie injectors... a fuel rail does NOTHING. a pressure riser doesn't do enough a better fuel pump MIGHT be enough but I'd definetly go with injectors.) they pull in much colder and there for denser air... so you can run lean cuz of how much more oxygen that translates to when compressed... that could blow your motor... fuel management is the MOST important thing to consider when running a turbo car... If I were you I'd find out what stand-alone engine management system most dsm'ers are using. and save up for that first... that way you can tune any mods from there out safely... you also might want to look into a wide band o2 to get accurate a/f ratio readings... DO NOT BUY ONE... look up "diy wideband o2" on google... they sell kits to solder together and buy your own o2 sensor... that's MUCH cheaper than buying one(cheapest ones are like 400+ dollars.).