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  • K&N Filter Universal Rubber Filter 3 Flange 4 1/2 Base inch 3 1/2 inch Top 5 3/4 inch Height
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K&N Filter Universal Rubber Filter 3 Flange 4 1/2 Base inch 3 1/2 inch Top 5 3/4 inch Height

K&N Engineering
KNNRU-5111
In stock
Air Filters - Universal Fit
$42.99
K&N Filter Universal Rubber Filter 3  Flange 4 1/2 Base inch 3 1/2 inch Top 5 3/4 inch Height Upgrade engine performance with the K&N...
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$42.99
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K&N Filter Universal Rubber Filter 3 Flange 4 1/2 Base inch 3 1/2 inch Top 5 3/4 inch Height
Description

K&N Filter Universal Rubber Filter 3  Flange 4 1/2 Base inch 3 1/2 inch Top 5 3/4 inch Height

Upgrade engine performance with the K&N Universal Rubber Air Filter. Features a 3" flange, 4.5" base, 3.5" top, and 5.75" height. Washable, reusable, and built to boost airflow.

Engineered for maximum airflow and exceptional filtration, the K&N Universal Clamp-On Rubber Air Filter (Part RU-5111) delivers high-performance air intake for custom, racing, and specialized applications. Built with a round tapered (conical) design, this filter features a 3-inch inside diameter (ID) pliable rubber flange, a 4.5-inch base outside diameter (OD), a 3.5-inch top OD, and an overall height of 5.75 inches.

Constructed with layered, oiled cotton gauze media sandwiched between wire mesh, this filter allows significantly more air into your engine compared to restrictive disposable paper filters. The heavy-duty molded rubber flange absorbs engine vibration for a secure fit and can stretch up to 1/16" (1.5mm) to accommodate slight variations in intake tube sizing. Fully washable and reusable, this K&N filter is designed to last the lifetime of your vehicle or equipment, making it an eco-friendly and cost-effective upgrade.

Best Uses

  1. Custom Air Intakes & Hot Rods: Fits custom fabrication setups requiring a compact 3-inch inlet.
  2. Motorsports & Track Cars: Maximizes intake airflow for racing engines where quick throttle response is essential.
  3. Small Engine Modifications: Upgrades air filtration on generators, snowmobiles, ATVs, tractors, and lawn equipment.
  4. Tight Engine Bays: The tapered cone shape (4.5" base narrowing to 3.5" top) provides clearance in space-constrained engine compartments.
  5. Off-Road & Dirty Environments: Offers high contaminant holding capacity with easily cleanable cotton media.

Features

  1. High-Flow Cotton Gauze Media: Multi-layered oiled cotton captures microscopic dirt while allowing up to 50% more airflow than standard paper filters.
  2. Flexible Pliable Rubber Flange: Ultra-strong molded rubber flange absorbs severe engine vibrations and stretches up to 1/16" (1.5mm) for a snug, custom fit.
  3. Round Tapered Conical Design: Engineered with a 3" flange ID, 4.5" base OD, 3.5" top OD, and 5.75" height for optimal space efficiency and surface area.
  4. Clamp-On Installation: Direct clamp-on connection allows installation in 5 to 10 minutes using basic hand tools (screwdriver/clamp).
  5. Washable & Reusable: Designed to be cleaned and re-oiled repeatedly using a K&N Recharger Kit.

Benefits

  1. Increased Horsepower & Acceleration: Improved air volume reduces intake restriction, unlocking extra power and faster throttle response.
  2. Long-Term Cost Savings: Eliminates the need to buy disposable replacement paper air filters over the life of your equipment.
  3. Engine Protection: Premium filtration media shields your engine against harmful contaminants, dust, and debris.
  4. Eco-Friendly & Sustainable: Keeps landfill waste down by replacing disposable air filters with a long-lasting, reusable unit.
  5. Vibration Resistance: Molded rubber end caps and flange prevent seal breakage under high engine vibrations and heavy load conditions.
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1. Returned products must be in new, unused condition and include the original box and/or packaging with all tags included.

2. Once your return is received and inspected by MotoKarMax (usually within 48-72 hours of receiving), your refund will be processed and a credit will be applied to your credit card or original payment method. Please note that depending on your credit card company, it may take an additional 2-10 business days after your credit is applied for it to be posted to your account.

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