Pro Design Pro Flow K&N Air Filter Kit PD219 Includes billet base plate which dramatically improves performance by directing and channeling air flow at a much highervolume for superior power gains Positive O-ring seal provides an absolute barrier against sand and debris This kit can save hundreds of dollars in engine repairs In dry riding conditions, with the Pro Flow Kits, you can completely remove your air box lid and maximize your air intake Your filter can now remain in place without the restriction inherent with the stock mounting lid