it is built now. and i built the car, my buddy(owner of CFT) and me tuned it.
i made 280hp 345tq with a stock engine, stock ecu and stock turbo with just a fuel pump, gutted intake, flywheel,exhuast and starion fmic.
Made 450 with same as above just a 60-1 turbo and jwt plugnplay kit
i made 489 on a stock bottom end with the same 60-1 turbo and jwt plugnplay kit with cams
I made 530hp and 501 tq (notice the tq? far above sr territory for that power level) with the same as above just built the motor because i broke it when i didn't know my fpr gauge was bad
All the above we also way before nistune exsited
and i've built numerous sr20 cars. even a 622hp one.. I love the sr motor but there is no comparison the vg owns the SR. Even more so in the z31 frame as you suggested.