The best filter in the world can't do its job if there are leaks in the seal of the airbox. That's why Twin Air provides a complete line of products to ensure a leak-proof, fool-proof fit. Don't let your stock set-up rob you of power and engine reliability. Twin Air is known for superior airflow filters. The PowerFlow Kit is a step above and beyond as it replaces the stock air filter cage with a stronger, lighter and better fitting version. These kits eliminate leaks and provide more air for power, and the filter can still be removed in a snap for cleaning. Twin Air eliminates the need for the spark arrestor screen because the PowerFlow air filter has a backfire-resistant layer of foam laminated to the inside surface supported by a rigid billet aluminum cage for improved airflow and power output. Billet aluminum cage provides a tight seal to the airbox and replaces your flimsy plastic stock cage.