Hi guys
I have a 2000 GUII Patrol ZD30 auto and I'm having some trouble with a noise that sounds like it's coming from the turbo. It happens when the car is under boost and acceleration generally above 2000 rpm it sounds like really bad belt screech. I've read that it might be gaskets but I don't know. When I bought the car it made the noise for a while then it kind of faded away and the other day I put a boost controller on it and since then it has been making the noise.
Has this happened to any of you if so what was wrong.

Really hoping it's something small like a gasket or maybe the egr.
Any input is greatly appreciated
Cheers Jack