i have a funnycar its s blast!!!!! i did a little reading about the motor and esc it looks like a castle mamba max pro 2400kv right?? As Fast as that car runs im thinking that be a great combo for a slash 4x4!!! The velineon 3500 brusless is a good system and i was getting the front end up abit so i thought id try a pro max combo to see if it kicked butt like the funnycar will but it slowed it down so i tryed a bigger pinon gear i it didnt help much.I have a field card n i hooked it up to the pro max esc an changed a few settings it didnt help much!! So any u guys have exp with the pro max combo and have any suggestions before i take it out and put the 3500 back in would be great!!