K&N 66-1401 X-Stream Round Top Filter replace the top of your existing round filter thereby adding additional filter surface area for increased air flow. The addition also redirects the air flow inside the filter to pull in more air for even greater performance efficiency. Cleanable and reusable, the XStream air flow top filter delivers the best protection available for your engine, and comes in a wide range of applications. This filter top has a 14 inch outside diameter featuring durable black powder coated trim with K&N logos embossed around the rim.