After seeing Hawk's mudding pictures I would just get some tires! 13 tooth sprocket will definitely help with acceleration but so would some nice tires. You're tires are so bald that you would definitely feel a difference in acceleration when you're hooking harder and you wont sacrifice top end. I put some meatier tires on and I love how hard the front end hooks and now the front end comes up since I'm hooking so hard in the rear. I know this isn't a HP mod but you'll like what you find!!!