I ran 5psi on stock returnless fuel system and ECU and the car ran ok for over 20k miles. I did have to short shift because the EGTs would hit 1500F by 5500rpms. You don't want to run hotter than 1500F on stock internals. You'll also want to get an EGT guage as soon as possible.

I'm not crazy about the turbo being only oil cooled. You realy want water cooling for turbo longevity.

2000 Rio Red I4 Cougar 200whp & 210wtq at 9psi 254whp & 276wtq with NX 35shot WRX TD04 Turbo, Cut Short Shifter, Strut Tower Bar, 17" ZN Wheels, Roush Springs, Starion Intercooler, NX 35 shot, HKS SS BOV, Full 3" exhaust,StreetFlight Chip