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If you remove the exhaust side.... while you are in there use Oven Cleaner to clean the crap out best you can. If you do a general Web search you can find several forums with discussions on this method of cleaning a turbo while still in the vehicle.

Something.... and it sounds like it happens along with turbo, is too shrill sounding. Could it potentially be a small leak that is whistling? Granted it does sound like the shrill of metal scratching metal.