Each hidden breather is o-ringed at the heads, passes through the backing plate and exits inside the mouth of the throttle body through the proprietary breather tubes. Hidden Breather backing plate technology is a step up from original system. Aluminum filter top plate has integrated filter mounting studs and directional air venturi for increased durability and performance. Filter offers over 200% more surface area than the factory filter and features a tapered bottom resulting in more filter surface area than any other performance intake. Performance filter is constructed from red pre-oiled surgical grade cotton and is washable/reusable. Radius air inlet provides maximum performance by providing unobstructed airflow. Kit includes one-piece backing plate, breather tubes, performance filter, filter top, gaskets, oil reservoir and necessary hardware.