Facelift Valve in exhaust system?

DanA3S3

Registered User
Hi,

So few weeks ago i got rid of my 8p A3 and S3 and got a 66 plate facelift A3 TDI S Line sportback, and noticed some sort of valve system on the exhaust? Cant seem to find anything about it online?

Just curious as to what its for?
 
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