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  • K&N Universal Air Filter (4in. Flange / 6in. Base OD / 4-5/8in. Top OD / 6in. Height)
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K&N Universal Air Filter (4in. Flange / 6in. Base OD / 4-5/8in. Top OD / 6in. Height)

K&N Engineering
KNNRE-0850
Auf Lager
Air Filters - Universal Fit
$68.99
K&N Universal Air Filter - 4 in. Flange | High-Flow Performance Filter Boost engine airflow and horsepower with the K&N Universal Air Filter (Part: RE-0850)....
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$68.99
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K&N Universal Air Filter (4in. Flange / 6in. Base OD / 4-5/8in. Top OD / 6in. Height)
Description

K&N Universal Air Filter - 4 in. Flange | High-Flow Performance Filter

Boost engine airflow and horsepower with the K&N Universal Air Filter (Part: RE-0850). Features a 4 in. flange, 6 in. base OD, and a washable, reusable design.

The K&N Universal Air Filter (RE-0850) is engineered to increase horsepower, torque, and acceleration by optimizing airflow to your engine. Built with layered, oiled cotton gauze media, this tapered cone filter delivers high airflow while maintaining filtration efficiency.

Constructed with an ultra-strong, pliable rubber flange, the filter absorbs engine vibration and creates a tight clamp-on seal. The flexible flange material can also stretch up to 1/16 of an inch (1.5mm) to fit slightly off-size intake tubes. Fully washable and reusable, this filter eliminates the need for disposable paper filters and comes pre-oiled for ready installation out of the box.

Best Uses

  1. Custom Engine Air Intakes: Fits aftermarket intake setups requiring a 4-inch inlet tube attachment.
  2. Racing & Performance Vehicles: Provides max airflow for track cars, off-road rigs, and tuned street vehicles.
  3. Universal Applications: Ideal for custom builds, tractors, generators, and specialty equipment with matching intake dimensions.

Features

  1. Pliable Rubber Flange: Absorbs engine vibrations and stretches up to 1/16 in. (1.5mm) for a secure fit on slightly varying intake tube diameters.
  2. High-Flow Cotton Media: Premium layered cotton gauze media delivers lower air restriction than traditional paper filters.
  3. Round Tapered Shape: Features a 6 in. base and 4-5/8 in. top diameter, maximizing surface area for optimal airflow in tight engine bays.
  4. Clamp-On Design: Simple installation using the included heavy-duty hose clamp to secure the filter to the intake pipe.
  5. Washable & Reusable: Designed to be cleaned and re-oiled repeatedly with a K&N filter care kit.

Benefits

  1. Increased Horsepower: Maximizes air delivery into the engine for improved throttle response and acceleration.
  2. Long-Term Cost Savings: Reusable construction replaces disposable air filters over the lifespan of your vehicle.
  3. Engine Protection: Premium filtration media protects against harmful engine contaminants.
  4. Flexible Fitment: Adaptable rubber material guarantees a snug clamp-on connection.
  5. Environmentally Friendly: Reduces waste by preventing single-use paper filters from going to landfills.
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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.

Returns:

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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