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Thought I'd give an update. After my exhaust was replaced the noise came back worse than before. I dropped it off at the dealer last night and they found a damaged gasket under the #1 Bank 02 sensor which was preventing the sensor from being secured properly and making it vibrate. They replaced the sensor and gasket today and the the noise is gone. The reason I mention this is that it made almost the exact same sound as the loose baffle in the muffler. Just and FYI.
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