drop the boost down to 12-13 psi, 15 is just blowing hot air?
at least get a safc2 then u will have a decent power upgrade
after that its pretty much done for stage 1
next step is turbo upgrade along with supporting mods or engine swaps
can sell it and for the price of a engine swap u can pick up a r33 (best bang for buck cars imo)
stronger box, phatter engine, modern interior
32 GTR or 34 GT-T pending budget is also very nice!