On my Outcast, I put in a 20 tooth pinion and street crushers and clocked 69mph. We all like to do it but really is a waste of cash. We spend the money for the pinions and tires, Spend time lowering it, Then when we get the speed we want, Its not bashable anymore because the tires are crap in the dirt, the pinion is too big causing over heating so we then take all the speed crap off and put it on a shelf and think (what a waste of money) But we all do it (we just got to). Save your money and do needed upgrades.