To reduce the size of the game to fit on a dvd5 simply delete the updatedash.xbe from the games files. This file is no longer needed. This is what I did and game works fine. When you extract the iso to a game folder to delete the file, make sure you remake the iso with qwix
get it here:
http://www.theisozone.com/downloads/xbo ... extracter/
or a similar tool to ensure it is xbox compatible. Burn with imgburn on decent media and play.
Qwix not only remakes the iso but removes long and short media flags in game files that can sometimes stop the game from working. My example is for the PAL version of the game (I can only assume it would be the same for NTSC)