Well, that's exactly what it sounds like. I can't seem to locate the origin of the sound but it seems like it's coming from the passenger rear. The sound is like you're shakin' the dice in the Yahtzee cup (but with just 1 die.) Anyone read a TSB about this, or have it happened to them, or have a similar sound? Could use some help diagnoising it before I even think about taking it to the dealer.

 

^^^that happened to me...it was coming from the left rear speaker for me and i took it in to the dealer like the day after i heard it and it stopped on the way over there and they said that they wouldnt take apart my car unless they heard something...but i havent really heard it since though so thats a plus

 

I shook my right exhaust tip to rock the car enough (seems it needs some side to side sway rather then up and down) and it makes the noise like directly to the right of the rear passenger seat.