Mine does it too. Sounds like a semi slowing down, just not that loud. Really noticeable when coasting to a stop between cars. Check some of the other forums, they have plenty of theories, but the general consensus is the Isolated Drive System, which seems to be where the noise is coming from. However nobody can get a dealer to find anything wrong (go figure). Everytime I take it to the dealer (twice) I ask them to check it, but both times they didn't find anything wrong.
2010 FLTRX - "Black Plague"
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