Just to help anyone who is thinking of running imports on their cube, since i get a few messages about how to do it.
Method One: Freeloader
A simple boot disc by Datel. Insert the disc and boot the cube. You are then prompted to insert the disc you want to play.
Pros: Very easy to set up, no modification to the console needed.
Cons: Some games have incompatibilities using the Freeloader discs. There arent many games that have this problem.
Method Two: Region Switch
Involves opening your cube and installing a small spst switch in your cube (or it can be a push button, rocket, etc). Once installed, you flip the switch and the gamecube switched between jpn/us region instantly. A multicolor led can even be added to change the color depending on the region the gamecube is set to. My preferred method.
Pros: Perfect compatibility. The gamecube is not faking the region but it actually becoming the region the switch is set to. There will be no compatibility Problems.
Cons: Involves opening up the gamecube and soldering two wires to the motherboard. The points are somewhat small, so some soldering skills are needed. Mounting the switch can be a small pain if you do not plan ahead.
Method Three: Modchip
Installs a modchip into your gamecube. Allows import, as well as backups to be played on your system. Just put in the disc and play.
Pros: Allows all regions of games to be played, as well as other supported functions, such as upgrading (if a problem title ever comes along) and homebrew booting.
Cons: Requires opening up the cube and soldering 6 wires to your mainboard (The Qoob SX chip, there are others). Not for novices to soldering, and there is always a risk of breaking your gamecube if done incorrectly.