Had my 2.0 tdi bdk 2004 a3 for about 3 months now. I always drive it with the radio on so tend not to hear any strange noises.
Wife turned it off the other day and when i put my foot down to about 2000/2500 revs and either take my foot off the pedal or change gear i can hear a whooshing noise.
I am guessing this might be the turbo? Or could it be a boost leak? Or even a hole in the exhaust?
Or hear is hoping that it is supposed to do that