I have checked them out. The big difference is that with the SF kit you get the fuel system with fuel management, and it costs less than the maxrev kit which doesn't have either!
I also picked up a clutch
http://www.advancedclutch.com/catalo...ref=tg&tgid=20 (its the second one down) used off somebody, say they only used it for 500 miles. I believe this should be what i need when i get boosted.