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I could be wrong but maybe its wastegate rattle
 
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Yep, wastegate rattle most likely. Mine does it and, after 30 seconds or so, just suddenly quits. I suspect things get warm enough by that point to prevent the rattle from occurring.

Mine will go in the shop soon to resolve it, as I'm nearing the end of my warranty.
 

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Is the sound you are questioning occuring around 27-28 seconds?

That's the only real unusual sound I could hear.

But then again, I am half deaf. Comes with age and too many rock concerts in the 60s & 70s.
 
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