Boost leak?

parkerg36

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I have a 09 turbo SS. I only have upper intercooler piping and cold air intake mods. I had a few check engine lights, one was for the cam position sensors which was solved, the other was the internal blow off valve was sticking, since it wasnt holding tje 15 lbs of boost. that's now fixed. At the same time those were going on I had a high pitched winding noise. Which at the time being seems to be the only problem. What can the the noise be? I have no engine codes but the boost is at 15 when I don't hear this noise and 12 when I do. Do I have a boost leak? Any info would help.
 

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