You might want to read the current ROAR rule book to understand what is legal for racing, if you want to compete. They have technical specifications on the motors (2 pole), batteries (2s) and ESC's (blinking in stock). That 4pole motor won't be legal in sanctioned events, though for your first race they will let you run what you have in novice class. If you are going to buy something specifically to race, you probably want to make sure it is legal.