If he hunts around you can pick up a T28 off an S14 for around the 300-400 mark in good nick and even cheaper a GTR turbo off an R33 these are a T28 just the comp housing is a little smaller and only rated at about 300hp and they use the T2 type flange

if you want to go T3 just look at a R33 stock turbo these are T28 with a T3 flange on them and you can pick these are everywhere!

as a basic idea i was quoted 200-250 for mandrel bent cat back exhaust for my EK with extra flanges put in, the dump is going to cost around the $250 mark and if you that strap for cash just use the stock cat and punch it out.

either way the basic principle of a turbocharger exists on the fact that it has to build up boost just wait for the 3000 rpm to come to get your power :P