What about running this motor in a Mugen MBX6 Eco on 3s.
if the buggy is light enough, i say go for it. my crt .5 is pushing around 7lbs and it overgeared and the motor still stays pretty cool.
They say a good mechanic only needs 2 tools - WD40 & Duct tape. If it moves, and its not supposed to, duct tape. If it doesn't move, and its supposed to, WD40.