K&N Aircharger Intake System For Harley Twin Cam The K&N High-Flow cotton air filter is designed to deliver enhanced performance and protection. It boosts horsepower, ensuring a noticeable improvement in the vehicle's response. Features: Cast aluminum high-performance intake tube with raised detail Integrated internal velocity stack Built-in breathers replace external OE breathers Designed to improve throttle response and engine sound Washable and reusable filter