Why does my Audi A3 start making a hissing noise on acceleration?

I recently noticed that whenever I accelerate in my Audi A3, there is a loud hissing noise that I can hear coming from the engine. What could be causing this and how can I fix it?

The hissing noise is most likely coming from a damaged or deteriorating exhaust system. It is important to have this checked and repaired as soon as possible to prevent any further damage.

Another possible cause could be a leak in the vacuum system. This can cause the engine to draw in excess air, leading to the hissing noise. Get the vacuum system checked and repaired as needed.

If you have aftermarket modifications, such as an aftermarket air intake system, they may be causing the hissing noise. Consider replacing them with OEM parts to help alleviate the issue.