However, I adjusted the actuators down to a higher base boost first. My base boost was about 15 psi, and with my HKS EVC4 I was able to hit 26 psi easily. I have gotten other cars to run higher boost levels this way as well. I believe that somebody with sport 600's hit as high as 30 psi boost before with the actuators tightened down. External wastegates with the proper springs will make it easier to reach the higher boost levels.