K&N Engineering · New
K&N Oval Red 9in Intake System for Harley-Davidson
MPN RK-3910-1 · Store SKU knnRK-3910-1
Supplier stock checked 11/7/2026, 5:17:39 AM UTC. Adding a part does not reserve it.
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Product details
K&N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Built around the legendary K&N High-Flow Air Filter, the this RK Series assembly includes an innovative powder coated billet aluminum back plate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1. The latest addition to K&N's RK Series was developed to get more horsepower from your Twin Cam Harley-Davidson engine. Provides a significant airflow increase to the engine without sacrificing filtration. Intake System-Harley Davidson 9in. Oval Air Intake System
Manufacturer fitment & guides
Check RK-3910-1 against the manufacturer’s application information below.
Part-specific notes
- California Proposition 65: Y
