Halo mods/updates?

Every game has user made or even company updates to fix crappy ports. Resident evil 4 was pretty good after all the mods to improve the video and stuff were out, same with the star wars games etc. But has anyone heard of any Halo: Combat evolved updates? The graphics in that game are terrible and people have been complaining for years. Would be nice to see updated textures and levels and stuffs.