This was the pinnacle of my modding "carrier" of Halo 1, which was shortly after it begun. After that I mostly experimented with weird stuff and looked for hidden things.
Here lots of shaders have been swapped, as well as models, projectiles, particles and mainly... vehicle speed. I managed to get the level dark, so the fire from the wheels would be clearly visible.
It was a ton of fun to record, maybe I should boot up the old Xbox with a patched map...
Blog post: http://andreasaronsson.com/2008/06/17/halo-wheels-on-firehalo-wheels-on-fire/