I discovered that you can tighten the coiley spring on the cable and that is what you get because there is a REV LIMITER that stops you from going faster, you will notice it goes then cuts out then goes again and so on do to the rev limiter, so loosen the coiley spring then test drive, repeat untill it just stops hitting the rev limiter (i got 17mph on my phones gps speedo test)and thats as fast as your going to go, then put 23" tall tires on it (liftkit required) and you will be over 20+ mph