Quote:
Originally Posted by Sam_M550i
They all do it. It is the wastegate in the Turbo. Every M550i that does a cold start makes that 1-2 sec rattle.
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Ahhhh…yes, only on cold starts. I was actually thinking of the wastegate, but then thought BMW wouldn't allow that kind of slop. Robbyb83 nailed it too…the exhaust. You were in the right ballpark. Glad its not an issue.