600x300x76 FMIC = $365 justjap
3 inch mandrel bent turbo back exhaust $1k
bigger injectors and pumps = dont bother, ive seen stock injectors run this power
aftermarket ecu (budget $2000)
high flow R34 turbo, or a VG30 rear housing on your existing turbo 1.5k ~ or spend a tad more and get a HKS GT-RS bolt on nengun 2.2k
forget the highmount, save $$ on water/oil lines and changing dumps
then you have to add labour....