Why is my Audi A4's engine making a strange noise at high speeds?

I recently purchased an Audi A4 and have noticed a strange noise coming from the engine when I reach speeds above 75mph. It sounds almost like a grinding or rattling noise. What could be causing this and how can I fix it?

It's possible that your air intake system could be clogged with debris, restricting air flow and causing a strange noise at high speeds. Try cleaning or replacing the air filter to see if that resolves the issue. If not, take your car to a trusted mechanic for a thorough inspection and diagnosis.