Boyesen's Powerwing is the perfect air delivery enhancement upgrade used to increase horsepower and torque by maximizing your intake system. The Powerwing's unique design maximizes airflow to increase horsepower, torque and responsiveness, without restrictions to your existing carburetor. We recommend all motorcycle parts are fitted and tested by qualified professionals. If you are unsure about the part choice for your bike, please contact us before purchase. Fits: Honda CRF450R 2002-2006 CRF450X 2005-2014