get air out b4 you put air in. sort out exhaust first(ie dumppipe. Preferable SPLIT) , then some CAI, then save for a cooler. once you done that. EBC. injectors (GTR,RX7) pump (910 or GTR) FPR then replace turbo if you wanna stay cheap maybe rb25 or vg30 but something like a 2530 or 40 is ideal. see if you can find an stainless manifold for cheap 500ish. then get a tune