HPI has the "D-Box" thats a drift assist unit, same dam thing.
Club racing rules may or may not apply. You'll figure out real quick when someone see's it and starts bitchin'.
They are NOT ROAR approved LOL.
Put it in and have Fun !
I retired from RC, now life is all about guns and long range shooting.
Where I live many people even know EP cars......only stinky GP stuff......i am not allowed racing with or without gyro......bunch of rednecks.......as i use the car for speed runs and offroad.....inferno+inferno gt......next time i cross some gp onroad car, they will be sorry......