Ok a cool head improves your compression if i were you that's the first thing i would get, I would also get a set of v-force 3 reeds and a k&n air filter. I'm running the k&n's with outerwear and removed the airbox but if you do alot of mudding and puddles i would not recommend that. With a good set of pipes, reeds, and filter you will beat the 450. Also what pipes do you have?