Here is some feedback reguarding the Q trim wheel that I did. Im running a 3 bolt 72 with a P trim wheel and a Garrett .82 exh housing.. I'm using a TH DP with the intergral wastegate. 1.5" puck. I have the high pressure actuator. I couldnt get more than 24 psi. In talking to John C I thought maybe I was running out of turbo. He told me to wire the wastegate door shut to see if I could make more boost. I had already tightened the rod as far as it would go. After tying it shut with bailing wire and going around it 3 times I took it for a run. The boost went to 26 psi. When i got back and looked under the hood the wire had stretched and the door got pushed open!!!. I though damm I have some serious BP in there. I told John and asked if I should step up to the Q trim. He said to try 1 more thing,a Precision .85 first. I did and nothing changed. So he came to the conclusion that I had reached the choke point of the P trim wheel. He estimates thatI have over 50 psi BP in the housing for that to happen. I have since gone to a Q trim to try and am wating for a day to do it.