Mines stock as and its running in 7psi
Don't any higher than 9psi with the stock cooler (I personally go any higher than 7Psi, for safety sake),
Everything in the first reply is absoultly correct.
It is not worthe the risk, realibility issues, go spend $1149 on a hybrid intercooler kit, install it yourself, put boost up to 10Psi, and have fun, that should be a vast improvement over 5Psi. Plenty of people go over 10 Psi on stock turbine and computer but I dont thing it is a good idea, you will run into boost cut (by ECU) problems causing and catastrophic failure of the ceramic turbine. Dont go above 10Psi.
BTW: WTF is a "mines computer chip" I have not found anyone that replaces the R33 ECU chip, what am I missing?