I don't get any sounds that seem dangerous - but under hard accelleration towing our trailer, I get what sounds like a mechanical buzzing from the area of the muffler/exhaust system... I've had vehicles do that in the past from loose elements inside the muffler vibrating, or loose exhaust system connections - sure would like to find a way to stop mine, other than a new muffler - I like the way mine sounds other than the buzz...