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  • K&N Round Tapered Universal Air Filter 3.5in Flange ID / 5.75in Base OD / 3.75in Top OD / 6in H
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K&N Round Tapered Universal Air Filter 3.5in Flange ID / 5.75in Base OD / 3.75in Top OD / 6in H

K&N Engineering
KNNRF-1031
In stock
Air Filters - Universal Fit
$94.99
K&N Universal Round Tapered Air Filter | 3.5" Flange, 6" Height (RF-1031) Boost performance with the K&N Round Tapered Air Filter (3.5" Flange, 5.75" Base,...
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$94.99
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K&N Round Tapered Universal Air Filter 3.5in Flange ID / 5.75in Base OD / 3.75in Top OD / 6in H
Description

K&N Universal Round Tapered Air Filter | 3.5" Flange, 6" Height (RF-1031)

Boost performance with the K&N Round Tapered Air Filter (3.5" Flange, 5.75" Base, 6" Height). High-flow, washable, reusable cotton gauze media.

The K&N Round Tapered Universal Air Filter (SKU: RF-1031) is engineered to upgrade your engine's breathing capacity across custom, racing, and aftermarket intake setups. Designed with a 3.5-inch inner flange diameter, a 5.75-inch base, a 3.75-inch top, and a 6-inch overall height, this conical clamp-on filter fits tightly in compact engine bays without restricting intake velocity.

Constructed with premium multi-layer oiled cotton gauze encased in a durable aluminum wire mesh, this filter allows maximum airflow while maintaining strict filtration standards. Its ultra-strong, molded pliable rubber flange effectively absorbs engine vibration and can stretch up to 1/16 of an inch (1.5mm) to accommodate minor piping variations. Pre-oiled straight from the factory, this washable and reusable filter provides a lifetime of dependable performance, eliminating the need for frequent disposable paper filter replacements.

Best Uses

  1. Custom Cold Air Intakes: Fits custom-built or aftermarket intake pipes with a 3.5-inch outer diameter.
  2. Performance & Racing Applications: Ideal for track, drag, or off-road vehicles requiring maximum volumetric efficiency and high airflow.
  3. Engine Swaps & Tight Bays: The tapered profile allows high surface area filtration while fitting into tight spaces.
  4. Power Equipment & Specialty Vehicles: Works seamlessly on custom tractors, generators, snowmobiles, and recreational utility vehicles.

Features

  1. High-Flow Oiled Cotton Media: 4 layers of woven cotton gauze treated with a specialized tacking agent to capture contaminants while maximizing airflow.
  2. Pliable Vibration-Absorbing Flange: Molded rubber construction dampens engine movement and stretches up to 1/16" (1.5mm) for a precise seal.
  3. Space-Saving Tapered Design: Features a 5.75" base tapering to a 3.75" top over a 6" height to maximize surface area in tight engine compartments.
  4. Direct Clamp-On Fitment: Comes pre-oiled and ready to install directly onto standard 3.5" OD intake piping with no extra adaptors required.
  5. Washable & Reusable Construction: Built to be serviced with a K&N Recharger kit, restoring like-new performance again and again.

Benefits

  1. Increased Horsepower & Throttle Response: Reduced airflow restriction translates to immediate improvements in engine power output and acceleration.
  2. Long-Term Cost Savings: Eliminates the need for continuous replacement paper filters over the lifespan of your vehicle.
  3. Engine Protection: Efficiently captures harmful dust, dirt, and debris to safeguard internal engine components under harsh conditions.
  4. Eco-Friendly Choice: Reusable design keeps disposable paper filters out of landfills.
  5. Hassle-Free Maintenance: Long service intervals mean you only clean the filter when dirt buildup warrants it (up to 75,000 miles under normal highway conditions). 

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1. Shipments to the Contiguous 48 US States Orders $149.99 and over qualify for our fast free shipping offer. We have worked with our shipping companies and integrated their shipping prices with our website for customer comfort.

2. Please see our International Orders page for orders shipping outside the US. We have worked with our shipping companies and integrated their shipping prices with our website for customer comfort.

3.For a specific delivery ETA based on the exact item(s) you want to purchase, please call us at (248) 832-2444 or message us via Chat before placing an order.

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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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