Before adding any code, you need the master code. Note that unlike PS2, GameCube Gecko codes do not always require a universal master hook, but for Most Wanted, use this WiiRD formatted code at the top of your list:
NTSC-U (USA):
C20F3170 0000XXXX (Do not add this manually—ensure "Enable Cheats" is checked in Dolphin Properties) need for speed most wanted gamecube gecko codes updated
PAL (Europe) – Recommended version for most mods: Because the PAL version runs at 576i natively, most updated Gecko code archives prioritize PAL (G2MP01). Before adding any code, you need the master code
0403A204 60000000
Moon Gravity (Jumps send you flying)
Instant Spike Strip Destruction
Super Slow Motion (Bullet Time)
You might ask: Aren't Action Replay codes enough? The short answer is no. Gecko codes are superior for three reasons: Moon Gravity (Jumps send you flying)
0402F8A4 3C0005F5
0402F8A8 6000E0FF