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the ratting noise is likely exhaust related.

I had the same issue and ignored it for 3 weeks until it became too annoying. I took it to a muffler shop they put it on a lift and guess what, they could not get it to rattle. ...it was likely a piece of metal from the innerds of the CAT converter came loose, ...it is interrmittent because it will often go back into place. after that day at the muffler shop, knock on wood, it has never came back.
 
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