I was driving the other day and started to get a pretty bad shake during idle and bouncy during acceleration. CEL came one and the cruise control light was blinking. went to AZ to have the codes pulled. P0011, 21, 0202, and 0204. Camshaft position blah blah blah bank 1 and 2, and misfire cylinders 2 and 4. Had my brother look at the AVCS solenoids and oil screens. Sure enough, one of the screens busted and jammed up one of the noids. He took the screens out and unjammed the solenoid. It ran fine for about an hour, then on the highway, CEL came back on, and I had no boost. Took it back to him to check out the oil screen goign to the turbo. He said it was pretty dirty so he took it out. Tried to drive it, still no boost and tons of white smoke. Cleaned the screen and put it back in, no effect. He and I assume the turbo is gone. Is this a good assumption? If so, move on tot he next paragraph, if not, any other ideas on what could be wrong?
So, I'm not going to bother replacing with another stock turbo. If something breaks, I always say fix it with something better

Obviously, with a bigger turbo, Im going to need a new IC, fuel pump, injectors, and a new tune. What else am I overlooking? Also, can I get some suggestions on the parts? Is goign to a junk yard and pulling off some STI parts going to give me some noticeable power gains?