K&N RU-1027 Universal Clamp-On High-Flow Air Filter - 4" Flange, 8" Height

Vehicle Fitment

• Universal clamp-on design - suitable for many vehicles, intake systems and custom builds.
• No specific year/make/model/engine application listed - verify intake flange diameter and clearance before purchase.

Features

• High-flow cotton gauze media designed to improve engine airflow and performance
• Washable and reusable design for long-term use and cost-savings
• Pre-oiled and ready to install out of the box
• Molded rubber flange absorbs vibration and supports secure clamp-on mounting
• Round tapered shape suits many aftermarket and custom intake setups
• Durable construction for high performance and demanding use
• Up to 99% filtration efficiency when properly maintained
• 1-year limited warranty for original purchaser

Specifications

• Flange inside diameter (ID): 4.00 in (102 mm)
• Base outside diameter (OD): 6.50 in (165 mm)
• Top outside diameter: 4.50 in (114 mm)
• Height: 8.00 in (203 mm)
• Material: Oiled cotton gauze filter media
• Shape: Round tapered universal filter element
• Filter re-oil amount: approx. 2.19 oz (65 ml)
• Weight: approx. 1.9 lb (0.9 kg)

Included Components

• 1x K&N RU-1027 universal clamp-on high-flow air filter (pre-oiled)

Product Description

The K&N RU-1027 is a premium universal clamp-on high-flow air filter designed for aftermarket and custom intake applications where a specific vehicle-matched filter may not exist. With its 4-inch flange and moderate height of 8 inches, it is ideal for builds requiring flexibility in intake design while delivering improved airflow and strong engine protection.

Installation is simple: slide the RU-1027 onto a compatible intake pipe or adapter (approx. 4 in flange), secure it with a clamp, ensure proper clearance in the engine bay, and install. Because it comes pre-oiled and ready, no additional filter prep is needed before use.

As this is a universal-fit part rather than one tied to a specific vehicle make/model/year/engine, it is essential to verify your intake flange diameter, mounting clearance and orientation before purchase. Fitment listing for specific vehicles and model years is unconfirmed - buyers should confirm compatibility prior to installation.