Exhaust pipe rattles when car idles. Had muffler & tailpipe replaced, started rattling worse within a few months
Check the heat shield on the Catalytic Converter, after a few years they start to rust off and rattle. Crawl under the Pathfinder and bang along the Converter and muffler area and see where it's coming from.
Good chances are, it's from the heat shield since you already had everything changed from the Cat back.
Good luck and hope this helps.
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exhaust rattles when engine is idling
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