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okkkkkkkkkk fineeeeeeeeeeeeeeeeeeee...in order of importance:
-ditch the isis...i love the brand too but that and the greddy manifold both suck. you gain very little up top and steals alot from down low. not worth it.
-next recirculate...the car will run alot better
parts...
-get an ehaust manifold
-turbo outlet pipe/down pipe
-full intake
-bigger injectors (480cc or 555cc max for your goal)
-some type of engine management...piggy back or reflash is all you need. dont let these people tell you need haltech for a stockish bolt on setup. i have seen 100000x 300-320 cars on safc's, emanages, and reflashes. is it preferred no...stand alone or flash is the way to go...but will it work and be safe YES! (I have an s15 with bolt ons and i use an safcII but i'm stock everything except psi, exhaust side, front mount, intake)
-s15 spec r turbo or a disco potato...some people are going to try and sway you to a gt2871r...i personally didn't like it. it was pretty laggy but i had shitty cams and that shitbox greddy manifold...so thats on you. but for your numbers and goal i think a s15 or disco potato will be all you need (it will be SUPER responsive and fun...no spool time)
-boost controller to run 15psi (thats basically the limit for the turbos i suggested)
-in addtion i would strongly suggest head studs and a metal head gasket (stay away from cometic i've heard horror stories) for that kind of psi. 12 psi is about the max i would run on a stock gasket/head bolts.
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