mamba maxx

ok so this is the speed controll i have decided on, for 14 cells can i just disable the bec and run a reciever pack or do i have to use a ubec??? if i do can someone give me a link to a cheap one that works and how to wire it to where???? and im going back to a fiegao 8xl because i have got into racing on road so money went to that but this has got to get done because if i dont it will be this way for another year lol but i want it done unlike that mini zilla lol