Arlen NESS Monster Sucker® Air Cleaner - Black167580063 Product Description Hidden breather technology for a reliable intake that enhances the performance of the engine Hidden breathers are O ringed at the heads and exits out the mouth of the throttle body to provide efficient engine breathing, eliminating the need for any external hoses or hardware Filter is constructed from synthetic material that is water resistant, which in most cases eliminate the need for a rain sock Filters are reusable