Hill Kit (Accessory for Super Turbo 1000 Elite or Lithium models) Increases scooter torque and acceleration by up to 30% / Lower gear ratio also lowers top speed by 5mph on flat ground however will increase top speed on inclines. Increases scooter weight carrying capacity to a maximum of 300lbs on flat terrain. Is esential when going up any incline. Increases motor life span by reducing heat. Automatically installed free of charge when purchased at the same time as our Super Turbo 1000-Lithium or 1000-Elite.