How many cells are you running on? If you run on 12 cells, a 6 or 7xl will give you the max power (for the feigao motors) You can always get more power by running more cells (lipoly maybe? It won't cost too much more than dual brushless to convert) and a higher wind motor to handle the power. Getting one of the large LMT lehner motors would also push the truck pretty fast, although I don't know if you could fit it (lengthwise) in your savage.