The Powerflow Throttle Body Kit is an off-the-shelf, easy to install, throttle body performance kit that creates more power and better throttle response. The kit comes with two different performance options, one for low-mid range performance and the other for top end performance. The Twin Air Powerflow Throttle Body Kit Configuration #1 provides low-mid range gains utilizing a smaller diameter intake tube and a lower profile throttle valve. This configuration increases the throttle response making the power more controllable. The Powerflow Throttle Body Kit Configuration #2 is designed for increasing top end power gains by reducing the surface area of the throttle body valve. This configuration does not use the orange intake. For Yamaha YZ 450 F (2010-2013).