UE ; Unlimited Engineering. HB ; Hot Bodies. Here is the HB diff..
http://www.rc-monster.com/proddetail...d=HPI_PRO_DIFF ..
Nice setup, but first off, id get the normal Wanderer motor with mike's heatsink, second, the quark has 6s problems, it is rated for 6s but doesnt like it. I would run a heatsink on the quark and run 5s.. Should be an awesome setup!