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Hmmm. I hear what you're saying. There's only so many possibilities and it definitely sounds like its coming from engine air intake / turbo induction systems...
I wonder if you're stock diverter valve has taken a dump. They are largely made of plastic and known to fail under stock boost over time, let alone increased boost pressures.
The GFB DV+ would be a nice upgrade and reasonably priced at under $150 shipped. Might be worth a try.
Interested to hear if anyone else has any ideas.
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