If you take out the restrictor pill that the WRX uses, the actuator is either 7 or 5 psi depending on the year. Can't tell you which atm. Easiest way is to run just the wastegate as it sits with no restrictor pill. No cost at all. If that wastegate is too much, the cheapest thing you can do is buy a wastegate with the pressure spring for 5psi or less.