i was told that a safe boost would be bout 11 to 12 psi, but once you put an exhaust and pod filter the boost will rise to that amount from stock which is 9-10 which i was told by neil_se
The r32 wastegate actuator is different to other models so stock boost is 9-10psi, on an r33 and s13 its 7-8psi, so 11-12psi with your mods is pretty normal.
hope this helps.