if upgradeing an E10 to brushless, DO NOT just stick in a new motor and go
it will not last
you will need to swap all bushings to bearings,all aftermarket aluminum parts will be needed
i'm rebuilding one now that was put brushless without upgrading
it's a mess
if you want an E10 brushless, go with the flux 2
the belt drive is better
but i strongly suggest upgrading any drive parts
and when done, its still cheaper than the high priced cars and will be able to compete as hard