I just checked the upper UP and DP bolts, and they're tight. I have not checked the lower UP bolts yet. Yesterday on a trip to SLC from Evanston, my turbo started making weird noises like a plastic tie wrap hitting a fan blade whenever I entered the boost range above ~3-4 psi. It doesn't sound like an air leak. I just turned on this engine this afternoon in the parking lot with my ear close to the turbo and got a similar noise, but it's most pronounced when the engine is loaded.

Please don't tell me my turbo is dying....that would be bad.