Why does my Audi A4 engine start to make a rattling noise at high RPMs?

I've noticed that whenever I rev my Audi A4 engine above 5000 RPMs, there is a noticeable rattling noise coming from the engine. It doesn't seem to affect the performance, but it's concerning. Any ideas on what could be causing this?

This could be a sign of a loose heat shield on your exhaust system. It's best to have it checked out by a mechanic to avoid any potential safety hazards and prevent further damage to your car.

One possibility is that your engine is low on oil and is not being properly lubricated at high RPMs. Check your oil levels and top up if needed. If the noise persists, bring it to a professional for a more thorough inspection.