Sounds like you know what ur doin. your set up is almost identical to mine and I love it, I ride at 5000' and can get away with 91 octane in the cooler weather. I'll have to agree with bigred, you're gonna want a longer swinger... mine is a plus 2 and I'm planning on going to +4 or +6. You're deffinately gonna want a longer one at walden, I've seen Rippen's clips and the shit out there is crazy steep!! Oh and after the mods bigred suggested you shouldn't have andy probs with the 450's, my brother has a modded yfz that can't hang with mine in the steep shit or shootin the hills. :thumbsup: