brushless

[RC-Monster Mike]

You mean the xl4200? The xl5000 should not even be considered on 12 cells. It is too hot and will exceed its rpm limit. The xl4200 will be quite fast, but the runtime will suffer a bit. They work, for sure and I have run the xl4200 in my maxx, but they draw a lot of power (hard on the batteries and bad for runtime). If runtime is not your concern, the xl4200 is quite the powerhouse! Make sure you get the better speed controller for this one for sure!