My 'Pede needs BL power...

I was thinking of gettin an Mtroniks Pro and a 6L and run it on 3S Lipo. About what speeds would I be getting w/ this set up? And what gear should I run? I am also thinkin about the 12s after I read someone got up to 57mph on it, that is some insane speeds and that what I want, could the 6L do that? Anyways thought Id put up some pics of my pede, it has some FLM parts and the usual upgrades it has a dogbone conversion, going to see how that works out. I run nitro rush arms up front to line up the rear w/ the front and run wide offset rims all around, still waiting on some big bore shocks for it...