Thinking about getting a Power Addiction head for my SB Assault Just strictly for riding out west. High altitude 8000-12000ft. Want it to be as "plug and play" as possible, Dont want to hassle with race gas, but 91 octane is available at every place we stay. Questions are: Will it be a hands down difference over all my stock friends running their comparable snowmobiles? i know with everything else equal you lose about 3% of your power to every 1000' of altitude due to oxygen levels and so on... What does this head reclaim for you at altitude? Obviously with the pro chassis the numbers dont always mean as much as the feel. Next question is, will i need to reclutch for the extra power? I run what polaris recommends (cant remember right now without digging out the paperwork) as far as clutch springs, and weights, i know i ran the 62's last year and changed both the primary and secondary spring. I would also consider a clutch kit to throw in with the head. I thought the sled ran good last year but want that extra edge. I was still getting beat by a 800 PRO RMK that was clutched awful and never saw above 7700 rpms, while mine was running flawlessly. I have heard great things about the Power Addiction head and would really like your input guys. I know im not going to win against a longer track pro thats stock and running good, but know i can do better.