Actually the Rimfire is slightly more powerful, as it's Constant Current is 14A while that is MAX current for the Turnigy.

The Rimfire is billed as a "400" sized motor, so you can look for something slightly larger.

As an example, in a plane that calls for a 450, I put in a 480 motor and got MUCH better results.

Remember that increasing the KV rating MAY NOT be a good thing.

Brushless motors and ESC's ALWAYS operate at maximum output values from the batteries.

The ESC merely controls the pulse width to bring down the rotational speeds.

That means that as you open the throttle, the motor will try to attain the KV rated rotation rate, or burn itself up trying.

All too often people will put in a high KV rated motor thinking that this will increase power, when all they are really doing is overloading the motor.

In an ideal situation the KV * Voltage total will be attained when the plane is at full throttle and partially unloaded, letting the prop spin. Some loading is desired, but not too much.

Wattmeters are your friend!