K&N RU-3112HBK Dryflow Black Round Tapered Clamp-On Air Filter 4in Flange 6in OD

Vehicle Fitment

• Universal Fit - Designed for performance vehicles, cold air intake systems, racing builds, and any application with a 4.00 in. intake tube requiring a clamp-on tapered air filter

Fitment Notes

• This is a universal clamp-on filter - verify your intake tube outside diameter matches the flange inside diameter of 4.00 in. before purchasing
• Rubber flange can be stretched up to 1/16 in. (1.5 mm) to accommodate in-between sizes or angled intake configurations
• Oil-free Dryflow design - requires K&N Synthetic Air Filter Cleaner for servicing (sold separately); do not use standard K&N oil-based Recharger kit
• Not a direct OEM replacement for a specific vehicle - confirm fitment by measuring your intake tube diameter

Features

• K&N Dryflow oil-free synthetic media - no filter oil required, no mess, no risk of MAF sensor contamination
• Black Series colorway - stealth black filter body for a clean, aggressive engine bay appearance
• Round tapered (cone) design maximizes filter surface area for high-CFM airflow performance
• Ultra-strong molded pliable rubber flange absorbs vibration and provides a secure, leak-free attachment
• Washable and reusable - requires cleaning only every 50,000 miles under normal conditions
• Low-restriction design delivers strong airflow without the need for oiling
• Made in the USA
• Backed by K&N's Lifetime Limited Warranty

Specifications

• Series: K&N Black Series / Dryflow
• Shape: Round Tapered (Cone)
• Flange Inside Diameter: 4.00 in. (102 mm)
• Flange Length: 1.50 in. (38 mm)
• Flange Type: Centered (Single)
• Base Outside Diameter: 6.00 in. (152 mm)
• Top Outside Diameter: 5.25 in. (133 mm)
• Height: 9.25 in. (235 mm)
• Filter Media: Dry synthetic (Dryflow) - oil-free
• Filter Color: Black
• Top Style: Rubber End Cap
• Inner Wire: No

Included Components

• 1x K&N RU-3112HBK Dryflow Black Series Universal Clamp-On Round Tapered Air Filter

Product Description

The K&N RU-3112HBK is part of K&N's Black Series lineup, featuring the company's Dryflow oil-free synthetic filter media. Unlike traditional K&N cotton gauze filters that require oiling, the Dryflow design delivers high airflow performance without any filter oil - eliminating the risk of MAF sensor contamination and making maintenance even simpler. Its round tapered cone profile - 6 inches at the base tapering to 5.25 inches at the top over a 9.25-inch height - delivers substantial dry synthetic surface area to support demanding 4-inch intake flows while maintaining excellent filtration efficiency.

The centered 4.00 in. rubber flange mounts securely onto matching intake tubes, absorbs vibration, and can be stretched slightly to fit in-between sizes. When cleaning is needed (every 50,000 miles), simply wash with K&N's Synthetic Air Filter Cleaner - no re-oiling required. The black filter body gives it a stealthy, premium look in any engine bay. Made in the USA and backed by K&N's Lifetime Limited Warranty, the RU-3112HBK is the ideal choice for performance and racing applications where oil-free filtration and bold aesthetics are both priorities.