K&N Engineering Universal Custom Air Filter

Universal Fitment

Part #: E-3988

Overview

The K&N Engineering Universal Custom Air Filter is a high-performance replacement designed specifically for Harley-Davidson® RK Series air cleaner assemblies. Crafted with precision and quality materials, this oval-shaped filter provides motorcycle enthusiasts with an effective upgrade to enhance airflow, filtration efficiency, and overall engine response. Its universal fitment makes it a versatile choice for riders seeking to improve their motorcycle’s performance and reliability while maintaining a clean, polished look. This air filter is engineered to support increased airflow, which can contribute to improved acceleration and throttle response. Its durable construction ensures long-lasting performance, even in demanding riding conditions. Designed for ease of installation, it offers a straightforward upgrade that helps optimize your motorcycle’s intake system without the need for extensive modifications.

Key Features

This universal custom air filter features a high-quality, washable cotton gauze media that provides excellent filtration while allowing maximum airflow. The oval shape and precise dimensions ensure a snug fit within Harley-Davidson® RK Series air cleaner assemblies. Its rugged construction includes a durable rubber flange that seals effectively against dirt and debris, protecting your engine. The filter’s design emphasizes ease of maintenance, with a washable and reusable media that supports ongoing performance. Its sleek, black finish complements a variety of motorcycle styles, adding a subtle touch of performance-oriented aesthetics.

Construction & Design

The filter’s construction utilizes a high-flow cotton gauze media encased in a durable, epoxy-coated aluminum wire mesh for added strength and filtration support. The rubber flange is molded for a secure fit, ensuring a tight seal that prevents unfiltered air from bypassing the media. The oval shape is carefully designed to match the dimensions of Harley-Davidson® RK Series air cleaner assemblies, providing a seamless upgrade.

Installation & Fitment

Installation is straightforward, requiring no special tools or modifications. Simply remove the existing filter and replace it with the K&N Universal Custom Air Filter, ensuring proper seating and sealing. Compatibility should be verified against your specific motorcycle model and air cleaner assembly to ensure optimal fitment.

What’s Included

The package includes one high-performance oval-shaped air filter designed for universal fitment with Harley-Davidson® RK Series air cleaner assemblies. No additional hardware or accessories are included.

Ideal For

This air filter is ideal for motorcycle enthusiasts looking to enhance their Harley-Davidson® RK Series air intake system with a reliable, washable filter that supports improved airflow and filtration. It’s perfect for riders seeking a durable upgrade that combines performance, ease of maintenance, and a sleek appearance.