I'm also experiencing a noise when starting my car in the morning (first 2mins). But mine is coming from one of the exhaust manifolds. I inspected it on ramps while someone turned it on and found that rattles ever so slightly then after its hot it goes away. Mine is prob a exhaust leak waiting to happen but I'm not too concerned about it as long as it goes away after warm up.
This may or may not help with the rattle dilemma.
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