If you do not own a physical GameCube or Action Replay, you can use the on PC. Dolphin has a built-in "Cheats Manager" that uses the same AR codes.
Nitrous never runs out—tap boost continuously. nfs most wanted gamecube ar codes
Use these to set your wanted level instantly. If you do not own a physical GameCube
If you want, tell me your game region (NTSC-U, PAL, NTSC-J) and I can look up region-specific AR codes and a short step-by-step entry list for your Action Replay device. tell me your game region (NTSC-U
06000000 00000000 0485F3E8 05F5E0FF (Europe/PAL)
Up, Down, Up, Down, Left, Right, Left, Right