Isx15 2250 turbo squeal

[JasonD5746]

Hey guys.. truck has boost, pulls strong, no codes.. but bad squeal on hard acel, and above 20psi boost. Sounds like a balloon releasing air slowly... You know, when u do that as a kid to make noise..
Put boot on turbo, hecked for boost leak at 40psi shop air, no squeal. Turbo seems to have normal amount of play, not leaking any oil into air charge. My 99th guess is that leak is between x manifold and turbo. Anything else that I should check.? I'm waiting for truck to col down atm. Ty