you can only run about 11psi w/out hitting fuel cut. Buy a Fuel Cut defenser from HKS or Install a Lexus AFM and larger injectors with an Apex-i SAFC.
You also would need a free flowing exhaust...and air filter. Don't run more than 14-15 psi on the factory turbo. If you want more power than than these mods give you do some research, plan on spending a lot of money and make a plan before you start buying parts.
With these parts and some dyno tuning you can make around 300rwhp on a factory turbo.