The R6 has an updated prop-grab kind of system, where the top of the motor is textured to grab the prop better than the R5.
The 2306 2450kv Limited Edition FPV motor, by Brotherhobby, is the company's newest offering. Built to compete against the other 2306 motors on the market, like the Emax RS2306 and the T-Motor 2306, the Brotherhobby motor offers fantastic low end torque and high end speed. This combination is what has made the 2306 motors a favorite for racing and freestyle pilots alike. Additionally, the Brotherhobby 2306 2450kv Returner R6 has Ezo bearings, which cut down on the weight while simultaneously allowing for higher motor RPM. The motor is also "naked", meaning that it has a minimal bottom so as to cut down on the weight of the motor. Although the weight savings is minimal, it all adds together to make a motor that can seriously rip