Hissing under acceleration

Jamesc14lnk

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Joined
Jan 22, 2022
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Cumbria
Hi everyone,
Just got rid of my S3 8P for another 3.0tdi V6. I have an A6 C7 and there is a hissing noise under acceleration. I have just changed the intercooler and checked the pipes that I can see with no splits or holes. Are there any common places where it can be leaking?
No codes showing up. Thank you