also depends on how much boost you intend on running. I can’t get more then 21.7 psi at 100 percent duty cycle on my boost controller. I might be able to get more boost if I tighten the waste gates. I was talking to seb a few weeks ago and he said he tightened his wastegates all the way and he couldn't get more than 23 psi. Splparts sells forged actuators and they have more about them on their web site.