Last time this happened to me was on a Citroen BX19 which was a rebuilt write off that I had had for over 100,000 miles since rebuild. Wouldn't expect it on a relatively new car of any make! Back to the main stealer I think - I bet exhausts for this will also be available through most of the exhaust specialists as well!
Citroens since 1969
Currently DS4 2.0hdi 180bhp EAT6