Turbo harness allows you with the push of a handlebar button to select between fan running all the time or fan running off of the factory temp sensor.
This full shroud is designed for XC racing or woods riding where your speeds are lower and a fan is needed to pull more air through the radiator to lower coolant temps. The full shroud allows the fan to pull air through the entire radiator surface area and not just from the fan surface area itself.
