Ok guys, I've been tiring to solve problem on my own with no luck. Here is the issue, I have an 2003 f350 with a 6.0 with about 100k on it. Last year I was driving an it started giving me the sucking noise while going up hill. I felt that the fins on the turbo were sticking. I took the turbo out to clean, not much soot but was defiantly some, the ring inside had a crack so I replaced just ring and gasket on top, and cleaned inside very well. I marked everything and put back together. When I did the truck drove as is if it had no power, I checked all hoses and clamps and they looked ok. Then I took it to ford where they told me I have no boost and that I needed a new turbo. I said well it worked before so it can't be so. Went home, and rechecked everything, took inter cooler out, all was fine, inspected all hoses and clamps, replaced two turbo clamps and new cac elbow hose to be sure, still no power. I can hear the turbo spool it just doesn't have boost power. Oh I also took egr out and it was clean, but I cleaned it very well. I have ensured I don't have leaks at turbo clamps. Could anyone give me some added direction before I attempt to buy a new turbo. Could it be a simple air filter or something I'm overlooking. Also my map reading is 14.3 and I don't have any codes with a scan tool. Sory this is so long, wanted to thorough, any help will be appreciated!!!