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I am getting this same 'rattle' you describe at what seems to be the same time; while boost is building to 1 bar. I never thought of it as being detonation. It sounds like it is coming from the left bottom rear, like it is actually coming from the turbo/wastegate area. I still have the original turbo, and thought this might be the issue. I have been thinking of going to the K27-7200 and this 'rattle' was starting to help me jump off the fence on that decision.
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2009 997.2 C2S
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