Why is the Audi A7 engine making a loud noise?

I have noticed that my Audi A7's engine has been making a loud noise lately. It's not a constant noise, but it comes and goes. It's not extremely loud, but it is noticeable. What could be causing this and should I be concerned?

It's possible that the loud noise is coming from a loose exhaust manifold. This is a common issue with Audi A7s and can lead to a rattling or buzzing noise. It's important to get this checked by a mechanic as soon as possible to avoid any further damage to your engine.