K&N X-Stream Top Air Filter - 66-1401K&N X Stream Top Air Filter 66 1401 K&N XStream Air Flow Tops replace the top of your existing round filter and add a new dimension to engine breathing by feeding your engine all the air it can use. They are washable and reusable just like other K&N Air Filters. * Filter Material Cotton Gauze * Height 25 mm * Top Material Black Powder Coated * Outside Diameter 356 mm 14" * Weight (0. 8 kg) * Filter Re Oiling Amount 27 ml * Washable Yes