Ok, the Novak link pretty good info. Here's what i'm looking to do, i have upgraded my Slash 4x4 ESC from the VXL to one of my spare MMP's (way smoother than the stocker). I'm still at this this point running the stock VXL motor, between gearing and ESC timing i'm pretty well maxed out as to what i can get performance wise. I'm looking for more power yet smooth and drivable. I'm seeing a ton of sensored 540/550 can motors (listed by KV) relatively inexpensive on Hobbypartz, Hobbyking, ebay etc. and am trying to figure out what to go with.