K&N Black Street Metal Air Cleaner Kit for 99-17 Harley Dyna Touring Softail FXS. STREET METALT AIR INTAKE SYSTEM. Guaranteed increase in horsepower. Aluminum backing plate with an integrated velocity stack provides a solid mounting surface. Built in breathers replace external OE breathers. Developed around an over-sized K&N high-flow air filter that is designed to […]