Features Big Sucker* "hidden breather" technology and a forward facing 65? intake design that produces the highest air flow performance, Hidden breathers are o-ringed at the heads and exit out the mouth of the injector/carb to provide efficient engine breathing, eliminating the need for any external hoses or hardware, Inverted 65 style filter features a built-in inverted top to pull in air not only from all sides of the filter but also the front, which directs more performance gaining airflow into your engine, Filter is constructed from synthetic material that is water resistant, which in most cases eliminates the need for a rain sock, Integrated radius air inlet for performance gaining unobstructed airflow, Filters are reusable and do not require oil, just rinse and re-use