Anyone know what this noise could be

[Adamkhan]

Hello I have a Audi A5 2.0 diesel and it's just started making a hissing/swish sound while accelerating, it doesn't do it in idle, only when accelerating.
I don't know if I am allowed to post links but here it is.



Thanks

 

[Gazwould]

Poorly turbo compressor wheel ?

 

[Buxton2901]

Boost leak?

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