I had this issue once already, sounded like a screaming cat under the car. For me it was an exhaust leak robbing the energy that would have gone to the turbo. Mix liquid dishsoap with water in a spray bottle and spray everything with the engine off.. and then turn it on and let it idle & look for bubbles. Sometimes the leak is so significant that it will just clear the area so keep spraying. I would do this first before messing with the EGR just because it's so simple.
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