[suicideneil]

I dont think the Muggy is that much heavier either, but I think its worth having a bit of a dig to find the other conversion threads. I would either say the 1515 in 1700kv flavour to run on 5 or 6s lipo, or the same with the 1521. If there isnt that much difference in price between the two motors, then the choice is simple enough provided the batts are capable also. Mind you, the medusa 70 and 80mm motors are coming soon, worth thinking about as it will take you time to get the muggy and strip it/ convert it, ready for the motor and electronics...