S&S Stealth Air Cleaner Kit For Harley Milwaukee Eight The S&S Cycle Stealth air cleaner backplate in this kit is made from the same high-strength, advanced, synthetic polymers used in high performance automotive intake manifolds and high-end handgun bodies! This material offers superior mechanical properties, thermal stability, and chemical resistance. Features: Designed to reduce heat transfer to the intake air for more efficient induction For the rider who likes to go fast, but doesn't like to advertise Air directional stinger cone increases flow for better performance To reuse the stock air cleaner cover adapter 1213360 must be purchased separately May be used with any of the S&S Cycle Stealth Air Cleaner Covers High Flow Filter Kit with filter and spacers available Made in the USA