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Old 06-11-2016, 09:24 PM   #3
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Join Date: Oct 2013
Location: Vancouver, BC
Posts: 91
Either a loose heat shield or might be the inside of the catalytic converter has become detached and is rattling around.

With the engine off, tap the catalytic converter with a rubber mallet and see if you can make the same noise.

Hopefully it's just the heat shield.
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