Strange vacuum noise from engine bay

[Optimus]

Hi everyone i have got a rather irritating sound from the engine bay. It is not always present or audiable and can be replicated but isnt consistent in loudness or tone or at all during replication.

This sound that i can describe as air passing through a plastic cylinder or being squeezed through. Similar to when you are pumping up an air bed and the air is forced through makes this bird like noise.

It can be replicated only by pulling away under acceleration. 

- hard throttle, moderate throttle or little throttle replicates the sound but varies in its pitch and loudness. When turning and pulling away it seems to be louder irrespective of the throttle applied.

It sounds like a vacuum or air leak, but i cant seem to replicate this when idle and engine bay up its literally when pulling away. this has been a quirk on my car for a while i think even from being purchased, however its actually got worse now, i wonder if anytone elses car does the same thing?

 

Car spec 2024 40TDi Quattro Black Edition