K&N Engineering · New
K&N 4in ID / 5.25in OD / 2in H Custom Assembly Filter designed to fit Harley-Davidson Motorcycles
MPN RK-320B · Store SKU knnRK-320B
Supplier stock checked 11/7/2026, 6:42:03 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
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 dome-shaped chrome cover. 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. . High air flow with excellent filtration Intake System-Harley Davidson Custom Assembly Air Filter
Manufacturer fitment & guides
Check RK-320B against the manufacturer’s application information below.
A manufacturer application guide is not available for this listing. Request the exact application from JuiceBuilt before payment.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- Emissions acknowledgement required before purchase.
- California Proposition 65: Y
