I've heard they respond well to a shot of NoS I have a kit forsale if your interested. Other than that I think probably a pipe and chip might be your only hope. I do know that those things are tanks when it comes to bashin' bush and they climb like a goat.
Bought a mid size Ranger last week, only rode it a couple hours so far. Quite impressed, smaller and reasonable quick and easy to get around with. Shorter and narrower than the full size. Have fun with your new toy!
I would say just run and enjoy the Ranger as is until you are really bored with it and then get the sxs that suits your style at that time. The Ranger is a bit underpowered but it has it's own advantages.