The S&S Air Stinger Air Cleaner Kit for your 2008-2016 Harley Davidson Twin Cam throttle by wire motorcycle engines takes the existing high flow Stealth air cleaner and replaces the air smoothing stinger with a similarly shaped filter element. More filter surface equals a 55% gain over a factory filter. The Air Stinger filter element is washable just like the Stealth filters and designed to last for years.