Ability to fine tune your sled on the hill, enough fuel to properly fuel higher hp levels, good clean throttle response, etc, etc. What more do you need?
Run your Nytro in the high 11's and it will run great. Boost It Nytro's I've rode seem to make the best power 11.8 a/f. Probably find you will need to update your clutching once you turn it up....