It could be a few things. It could be the converter, muffler, heat shield.
Do this. Take a rubber mallet and tap on the system to see if you can reproduce the sound. If you can, try to locate where it is coming from. Keep in mind, it is common for the heat shields on the converter to come loose and rattle. Also, the inside of the converter or muffler could have come loose. That can't be seen, but you can locate it by tapping on the exhaust system with a rubber mallet.
Let me know what you find.
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Thursday, September 5th, 2013 AT 5:28 PM