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K&N Universal Clamp-On Air Filter - 3in Flg 4-1/2in B 3-1/2in T 5-3/4in H

*Photo may not represent actual product

This is K&N Engineering's universal clamp-on replacement filter, built on the brand's oiled cotton gauze platform. The manufacturer describes its filter media as engineered to support horsepower, acceleration, and overall engine response, and multiple layers of premium cotton gauze are used for filtration. Compared with a stock paper element, a buyer gets a washable, reusable filter that can be serviced repeatedly instead of replaced on every interval.

The main reason to choose this filter is application range. Because it is a universal design, it can be matched to intakes with different angles or offset diameters, which suits custom intake tubes, racing builds, and off-road or non-stock setups where no direct-fit K&N part exists. Ahead of install, check your intake diameters against the listed measurements, since the manufacturer's universal line covers a wide range of applications. Emissions-sensitive buyers should also note that the manufacturer directs owners to check its website for the CARB status of each part for a specific vehicle.

  • Filter Style: Universal clamp-on, for custom and non-OEM intake setups
  • Filter Media: Oiled cotton gauze, multi-layer
  • Maintenance: Washable and reusable; arrives pre-oiled
  • Fitment: Universal; verify intake tube diameter before ordering
  • CARB Status: Check manufacturer listing for the specific vehicle

FAQ:

Can this filter be cleaned and reused?

The manufacturer lists its universal clamp-on filters as washable, so the element can be cleaned and re-oiled rather than thrown away at each service interval.

Will this filter fit my intake tube?

The manufacturer states that the universal line is designed for a variety of applications, including non-standard intake angles and offsets. Confirm the flange, base, and height measurements against your tube with the manufacturer before ordering.

Is this filter CARB compliant for my vehicle?

CARB status depends on the specific vehicle. The manufacturer directs buyers to its website to check the CARB status of each part for their application.

Installing it yourself

Installation is generally straightforward. The manufacturer's guidance is to fit the K&N filter onto the filter adapter or intake tube and secure it with the supplied hose clamp. K&N's intake install guidance estimates about 60 minutes with simple hand tools, though a universal filter on your own tube may take longer to match up. Tighten the clamp fully and check that the seal is complete, because a loose connection lets unfiltered air bypass the element.

  • MPN: RU-3121HBK
  • Manufactured by: K&N Engineering
  • Units per SKU: 1
  • In Stock: 10
  • Product cannot be shipped to California.
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RU-3121HBK
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K&N Engineering
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Order before 5pm PST and this product ships same day
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