Is it necessary to upgrade the exhaust system in the BMW M3?

I've heard some people say that upgrading the exhaust system can enhance the performance of the BMW M3, while others say that it's not necessary. What is your recommendation?

Upgrading the exhaust system can indeed improve the performance of the BMW M3, especially in terms of power and torque. However, it may not be necessary if you are satisfied with the stock performance and sound of your M3.

You can definitely feel a difference in the performance and sound of your BMW M3 with an upgraded exhaust system. But keep in mind that it may also void your warranty.