Sega GT Online
Tested and working: Mod-chipped Xbox v1.2 Please Note: The Online stuff was not tested and if you want to get that running your own your own sorry, but all the offline stuff works fine and is a pretty good gran turismo clone
This game has been MIX region patched by kami knows what (probably DVD2XBOX) so I am unsure of it's original region, but I'm pretty sure it's NTSC-U. It should work on all original xboxs regardless.
Password for RAR file: