Take a pic n post it chap may be able to tell
Is it the back box thats noisy or the cat
It is possible to reduce exhaust noise usually resulting in a loss of power best to change it if your not happy
Im sure theres plenty of spares floating around
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BLACK RALLYE - phoenixWHITE RALLYE - valliant
http://public.servicebox.peugeot.com/
https://www.gov.uk/check-mot-history