2018 TDI 50 dump valve?

Dam0

Registered User
with all the hot weather i drove home today with my windows down to let the hot air out of my car. As i drove off and let my foot off the throttle, i heard what i can only describe as the sound of a dump valve. this only happened at certain revs, but i was surprised.

Have audi put some sort of valve in which hisses? (i like it)
 
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