Ok my 2006 f250 with egr delete, sct with Idp tunes, itp rr, 03 turbo, brand new suncoast kit, and a few other things that are irrelavent, won't hold boost past 20 psi. It still whistles loud, seems to work great as long as you don't go past 20-22 psi. When you do it drops off to 0 also you can hear a slight pop, and a little black smoke when it dose it. If you let off the trottle and ease back into it will work again. Provided you don't go past the 20-22 psi. What do you think turbo going out? I pulled codes with the sct and got none. Haven't gotten a chance to hook the ae up yet. When I do hook the ae up what paramaters do I need to watch while I drive it to make sure what it is. Thanks.