http://cheatsforgamecube.info Cheat for GameCube game Extreme G3: Infinite Shields And Turbos... Feed 2012-05-22 en http://cheatsforgamecube.info/extreme-g3/cheat/37362.html the "Press Start" screen, press L + R, Z, L + R, Z.
If you entered the code correctly, an "Unlimited Energy/Turbo" message will appear. Note: The effects of that code only last for one race and must be re-enabled before the start of the next race.]]>