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Supplier details checked 2026-09-23 · Test catalog
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This K&N custom air cleaner was designed to fit Harley-Davidson motorcycles. This K&N air cleaner is not street legal nor recommended by Harley-Davidson Motor Co., Inc. .
Intake System-Harley Davidson
Custom Assembly Air Filter
Excellent engine protection
K&N 4in ID / 5.5in OD / 2in H Custom Assembly Filter designed to fit Harley-Davidson Motorcycle
Air Intake System
Upgrade your Harley-Davidson with a K&N High-Flow Air Intake System, engineered for riders who demand both performance and style. This complete intake replaces the stock air cleaner with K&N's washable and reusable high-flow filter, increasing airflow for enhanced horsepower and quicker throttle response. The precision-designed backing plate and integrated velocity stack ensure smooth, efficient air delivery, optimizing engine performance on every ride. Built for long-lasting durability and a bold, custom appearance, the RK-3201 delivers the perfect combination of power, reliability, and standout style for your motorcycle.
K&N custom air cleaners are designed for use on older Harley-Davidson motorcycles. With proper carburetor calibration, these custom air cleaners can increase horsepower on your bike. Each custom air cleaner comes with a K&N high-flow air filter. These air cleaners are perfect for many applications, such as racing or off-roading. This custom air cleaner has a 2.625 in (67 mm) inlet and comes with one gasket. The back-plate is pre-drilled. Included is a gleaming round chrome cover.
Air Cleaner Assembly
