My local club doesn't have any class/rules regarding motor, as long it is electric touring then you can join the race. Lots of my friends are using 5.5t hobbywing sensorless brushless, when i tried their car i can feel the cogging during start and at low speed. And i dont like the feel of it. Is there any 5.5t sensored brushless out there? I haven't check Castle creation yet as you prefered.