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Try looking at everything boost-related, Check vacuum lines/hoses, boost solenoids, wastegate for rattle.. Any broken connections that pressured air might seep out, even if its a small hairline crack. If you check/replace everything and the problem still persists. you may have to take a look at your turbos. My old N54 had that same issue, Underboosting 8 lbs and going immediately into limp mode if I remember correctly, I changed everything and it ended up fine. Good luck!
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