DT-1 Air Flow Kit replaces your stock backfire screen with a screen-less cage, replaces your stock plastic cage with an aluminum one, and is sure to give your bike a healthy increase in horsepower. It also includes a DT-1 air filter. It is used by factory teams around the world. Note, the screen-less cage must be used in conjunction with our filter oil as our filter oil is flame retardant, thus allowing you to not have a backfire screen.