i may be selling a tbird hybrid ihi turbo come the spring so keep that in mind if you're not looking for a big aftermarket turbo..and the tbird bolts right up and is a nice improvment for the price
another way to go is to do a good qulaity exhaust system 2.5-3" prefereably mandrel bent system with a good free flow ro straight through muffler.
throw in a k&n filter either panel or open box cone.
chip to remove/change boost cut and run a max of 15 psi on the stock turbo(if its in good shape that is).
boost controller to control boost levels.
strongly recomend a boost guage, a wideband or at the minimum a narrow band AFR meter and maybe an egt if feesable.
next save some weight:
if practical remove a/c system if you're not using it.
remove spare tire(if you're a rebel lol)
and if you can't afford a gym membership remove the power steering pump/accessories
the above is assuming you don't have a money tree..it's some of the cheapest things you can do and the car will be alot quicker than stock(i'm assuming you're stock).