Once you remove the stock air filter box, you have to disconnect the breather tube that goes to the valve cover. This breather filter is the perfect solution for the breather tube. With it's 2" OD and 1-1/2" length it fits nicely above the valve cover. Comes with a connection tube and hose clamps. Colors may vary due to inventory on hand. We currently have blue and red in stock. Specify the color you want or we'll choose for you.