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The turbo should or shouldn't have the whistle as it were ... if it "develops" a whistle, I'd suggest it's the manifold leaking, or the bush in the turbo (if not a bearing type). Nothing dramatic, but would be running a spanner over some things - I developed a louder than normal whistle on mine (which I didn't mind actually!! lol), but it turned out to be the back two bolts of the manifold being loose ...
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