Why does my Audi 80 produce a high-pitched whistling noise when I accelerate?

I recently purchased an Audi 80 and have noticed a high-pitched whistling noise coming from the engine when I accelerate. It seems to get louder the faster I go. What could be causing this and how can I fix it?

The high-pitched whistling noise is most likely caused by a leak in the intake system. This can be fixed by inspecting and replacing any damaged or worn out hoses or gaskets.

Another possible cause for the noise could be a problem with the turbocharger. It is important to have this checked by a professional as it can lead to more serious issues if left unattended.

If your Audi 80 has a manual transmission, the noise could be coming from a worn out clutch disc. This can usually be fixed by replacing the clutch assembly.