K&N Engineering E-3988 Replacement Air Filter for RK Series Harley-Davidson Air Cleaners

The K&N replacement air filter for RK Series air cleaner assemblies is designed to increase horsepower and acceleration while providing excellent filtration. The air filter is washable and reusable and designed to be used as a replacement air filter for specific K&N RK Series air cleaner assemblies for Harley-Davidson motorcycles. The air filter is covered by the famous K&N Million-Mile Limited Warranty. The K&N replacement air filter for RK Series air cleaner assemblies, designed for Harley-Davidson motorcycles, are designed to increase horsepower and acceleration while providing excellent filtration. Associated products: 99-5000 Filter Care Service Kit Aerosol

• Million Mile Limited Warranty®
• Million Mile Limited Warranty

The K&N Engineering E-3988 replacement air filter is designed for select RK Series air cleaner assemblies on Harley-Davidson motorcycles. Its high-flow design supports improved horsepower and acceleration while providing reliable filtration for the engine. This washable and reusable filter offers a practical alternative to disposable replacement filters and is intended for riders seeking long-term performance and serviceability.

Built for repeated use, the K&N Engineering E-3988 can be cleaned and reinstalled when properly maintained with the recommended K&N filter care products. The filter is backed by the K&N Million-Mile Limited Warranty, helping provide added confidence in its durability. Use K&N 99-5000 Filter Care Service Kit Aerosol as an associated maintenance product. Installation and fitment should be verified against the motorcycle and air cleaner assembly before purchase.

This product is intended for automotive applications and may require acknowledgment of applicable California emissions restrictions. It is not identified as CARB approved, and EPA certification is listed as not applicable. Refer to applicable regulations and vehicle requirements before installation.

• Million-Mile Limited Warranty
• Washable and reusable construction
• High-flow filtration for select RK Series air cleaners
• Designed for compatible Harley-Davidson motorcycle applications

Features:

• High-Flow Air Filtration: Helps support increased horsepower and acceleration while protecting the engine from airborne contaminants.
• Washable and Reusable: Can be cleaned and reinstalled for extended service life when maintained according to K&N recommendations.
• RK Series Compatibility: Designed as a replacement filter for select K&N RK Series air cleaner assemblies.
• Million-Mile Limited Warranty: Backed by K&N Engineering's limited warranty for added product confidence.

Air Freight Prohibited: false
Not Carb Approved: false
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1