well its going be hard to find a saxo shell becasue i think they are discontuied or i my be wrong
well they just wont last as long or may destroy them selfs,melt becasue the amount of power been drawn from them as i found out, plus personally i would go with Big Named packs as they will lost alot alot longer than cheapo packs,
i have had my GP3000 packs for the past year and they still seem as they were new with a hell of alot punch left in them but when i bought 3 cheapo packs they lasted 2 races before they melted.
also how do i check rpm???
most of the motors usally have a sticker on the can which say how RPM etc.... they have,
if not you could invest in a motor dyno or ask a friend/mate if you could use theres and this will show all the infomation you will ever need