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It will be the downpipes that are rattling not the cats. The downpipes have small resonators at the bottom often mistaken as cats. These are quite common to fail at that sort of mileage.
 

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I know a guy whos rattled for over a year before he replaced them so I don't think it's mega urgent, it's usually the flexi at the top of the downpipes that starts to fail causing the pipes to vibrate.
 
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