I was doing 15psi on stock motor for 3 years with no problems. Evo Head and block are built. Gonna break it in on the stock evo 9 turbo with stock actuator which is around 12psi. After I'll put the FP Red which comes with a 25psi actuator after a loss of a pound or so in the system going through the piping and intercooler I'll be seeing 22 maybe spiking to 25 at times. For the time being I don't plan on going higher, that with a good tune should put me over 400 to the wheels.
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