Why does the Audi A6 have dual exhausts?

I've noticed that some versions of the Audi A6 have dual exhausts, while others only have a single exhaust. What is the purpose of the dual exhausts and are there any benefits to having them?

The dual exhaust system on the Audi A6 is designed to improve engine performance and sound. By allowing more efficient exhaust flow, the engine can breathe more easily and produce more power. Additionally, the dual exhausts create a deeper and more aggressive exhaust note, enhancing the overall driving experience.