This happen to mine and got it replaced by audi brand new part...
Ended up being some specialist making the mistake of draining the diff rather than the haldex during a service :/
I've not had an issue with the exhaust system but my rear washer was also blocked (seems to be a common fault).
I was quoted by Cardiff Audi £18 for to fix the washer but I've not got round to sorting it out yet!
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