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I had this noise.. for me it was a factory defect in the form of a loose radiator. With the car stopped i could never tell but while driving it would rattle like mad. Once the dealership ran some tests & found the source, they tightened it down and i haven't had a problem since.. it could be worth a shot to check it. For what it is worth when i was in the car it sounded like it was coming from the firewall as well.
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