Why does my Audi A5 produce a rattling noise when accelerating?

I recently noticed that my Audi A5 has started to produce a rattling noise when accelerating, especially at higher speeds. What could be causing this and how can I fix it?

It could be due to a loose exhaust heat shield. I recommend taking your car to a mechanic to have it checked and tightened if needed.

Another possibility could be that your catalytic converter is failing. This is a more serious issue that should be addressed as soon as possible. I suggest having it diagnosed and replaced by a professional.