Each hidden breather is O-ringed at the heads, passes through the backing plate and exits at the mouth of the throttle body through proprietary shooter tubes; eliminating the need for any external hoses or hardware Filter does not need oil, just wash and reuse for long-lasting performance Backing plate is CNC-machined from forged aluminum Features Arlen Ness Big SuckerÖ breathing technology Radius air inlet provides unobstructed airflow Synthetic air filter is handmade in the U.S.A.. AIR CLNR FIN CHR 88-20 XL
