Since Need for Speed: Carbon is now considered "abandonware" by many (as it is no longer sold on digital storefronts like Steam or EA App), players typically find it through:
For the first time, you weren't alone. You could hire Blockers to ram opponents, Scouts to find shortcuts, or Drafters to give you that much-needed speed boost.
Websites like MyAbandonware often host the original game files.
Desired (using an Xbox or PS5 controller)