The HPI RS4 Sport 3 comes with a 15-turn Non-adjustable and Non-rebuildable Brushed Motor.
I have an Orion Vortex 10.5 Brushless Motor just sit'n in the closet.
But if the 15-turn Brushed Motor is faster in the chassis than the 10.5 Brushless Motor; I'll keep the 15-turn installed.
Thank You