you will need :
a good name brand turbo i'd suggest a big tdo5 or small t3 ! $8-1200, a Bov $50-200, Wastegate internal is cheapest (built into turbo), piping 2" is a good size $1-200 , 2zz turbo manifold $300ish or flanges and piping for rear mount , Down pipe , oil fittings & lines , and a way to tune fuel and ignition $500ish for an aem fic another $300 for a boomslang harness , and finally a dyno tune 1-2 hour worth.
if i had it to do all over again i would have just gotten cams lol
03 GT, t3/t40e rear mounted, aem fic,550cc inj, mwr fuel pump, 2 row rad, trd thrmostat, wmr shifter, tokico struts, st springs, progress bars, 17x7 235/45