I'm planning on running at least 7 cells and probably 8 cells every once in a while. I would be happy with mid to high 40mph range though. I cut the mounting bead off the stock 2.2 Masher 2K's to make them fit in the 2.8 Jato wheel. And for the chassis, I bought another stock chassis to use. Then I cut a piece out of the new chassis and I cut the current chassis and added them together with a 2 part epoxy (plastic welding system). I was wondering about the strenght, but I have put the truck through hell and haven't had any problems yet. I bought the brushless sytem off Ebay. It was from Allen Mueller on here. $220 something shipped to my house so I couldn't pass it up.