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K&N Engineering - Performance Air Filters, Oil Filters, Intake Systems & More

Founded in 1969 in Riverside, California by racers Ken Johnson & Norm McDonald, K&N Engineering revolutionized filtration with the first washable, oiled cotton High‑Flow Air Filter™, designed to boost airflow while keeping engines cleaner—crafted to be reused for up to one million miles.

Over the next five decades, K&N expanded into bolt-on cold-air intakes (1992), Wrench‑Off oil filters (1988), cabin filters, fuel filters, and home A/C filters—now offering over 12,000 SKUs worldwide. Their 400,000 sq ft Riverside HQ, along with facilities in Texas, the UK, Netherlands, and China, houses advanced R&D with airflow benches, chassis dynos, vibration labs, and NASCAR/NHRA-grade pipelines.

K&N products are dyno-validated, ISO-tested, and built for both professional motorsports and daily drivers. Their renowned Million‑Mile/Million‑Mile warranty and global customer support reflect a legacy of trusted performance. Today, K&N continues to lead in innovation—delivering sustainable, high-performance filtration for millions of vehicles on the road.

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K&N Universal Air Filter - 2-7/16in Flange x 3-1/2in OD x 4in Height K&N Universal Air Filter - 2-7/16in Flange x 3-1/2in OD x 4in Height
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K&N Universal Air Filter - 2-7/16in Flange x 3-1/2in OD...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3 1/2 inch OD 6 inch Height K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3 1/2 inch OD 6 inch Height
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K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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K&N Filter Universal Rubber Filter 2.25 inch Flange 3.5 inch OD 5 inch Height K&N Filter Universal Rubber Filter 2.25 inch Flange 3.5 inch OD 5 inch Height
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K&N Filter Universal Rubber Filter 2.25 inch Flange 3.5 inch...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$63.95
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K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3 1/2 inch OD 4 inch Height K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3 1/2 inch OD 4 inch Height
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K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$42.95
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K&N Universal Filter 2 1/16in Flange / 6in OD / 2in H / CR TP V K&N Universal Filter 2 1/16in Flange / 6in OD / 2in H / CR TP V
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K&N Universal Filter 2 1/16in Flange / 6in OD /...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$63.95
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K&N Filter Universal Rubber Filter - Round Straight 3.5in Base OD x 3.5in Top OD x 5in H K&N Filter Universal Rubber Filter - Round Straight 3.5in Base OD x 3.5in Top OD x 5in H
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K&N Filter Universal Rubber Filter - Round Straight 3.5in Base...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$67.95
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K&N Filter Universal Rubber Filter - Round Straight 1.688in Flange ID x 3in OD x 4in Height K&N Filter Universal Rubber Filter - Round Straight 1.688in Flange ID x 3in OD x 4in Height
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K&N Filter Universal Rubber Filter - Round Straight 1.688in Flange...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$63.95
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K&N Universal Filter 3 inch Flange 6 inch Base 5 1/4 inch Top 5 inch Height w/ Polished Top K&N Universal Filter 3 inch Flange 6 inch Base 5 1/4 inch Top 5 inch Height w/ Polished Top
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K&N Universal Filter 3 inch Flange 6 inch Base 5...
K&N Inverted Top Universal Air Filters - This unique approach to filter design and concept utilizes a filtering top that actually inverts, dropping into the...
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$76.95
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K&N Round Tapered Universal Air Filter 2.75in Flange 5.063in Base 4.5in Top 5in Height K&N Round Tapered Universal Air Filter 2.75in Flange 5.063in Base 4.5in Top 5in Height
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K&N Round Tapered Universal Air Filter 2.75in Flange 5.063in Base...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$117.95
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K&N 4in ID / 5.25in OD / 2in H Custom Assembly Filter designed to fit Harley-Davidson Motorcycles K&N 4in ID / 5.25in OD / 2in H Custom Assembly Filter designed to fit Harley-Davidson Motorcycles
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K&N 4in ID / 5.25in OD / 2in H Custom...
K&N custom air cleaners are designed for use on older Harley-Davidson motorcycles. With proper carburetor calibration, these custom air cleaners can increase horsepower on your...
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$130.95
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K&N 4in ID / 5.5in OD / 2in H Custom Assembly Filter designed to fit Harley-Davidson Motorcycle K&N 4in ID / 5.5in OD / 2in H Custom Assembly Filter designed to fit Harley-Davidson Motorcycle
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K&N 4in ID / 5.5in OD / 2in H Custom...
K&N custom air cleaners are designed for use on older Harley-Davidson motorcycles. With proper carburetor calibration, these custom air cleaners can increase horsepower on your...
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$180.95
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K&N Universal Chrome Filter 2 3/4in FLG / 4 1/2in Bottom / 4 1/2in Height K&N Universal Chrome Filter 2 3/4in FLG / 4 1/2in Bottom / 4 1/2in Height
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K&N Universal Chrome Filter 2 3/4in FLG / 4 1/2in...
K&N adjustable fitting Universal Air Filters are made with flange inserts which adjust the filter's flange to one of three inside flange diameters. The flange...
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$33.95
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K&N Universal Air Filter Chrome Round Tapered Red -4in Flange ID x 1.125in Flange Length x 5.5in H K&N Universal Air Filter Chrome Round Tapered Red -4in Flange ID x 1.125in Flange Length x 5.5in H
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K&N Universal Air Filter Chrome Round Tapered Red -4in Flange...
K&N Universal Air Filter Chrome Round Tapered Red -4in Flange ID x 1.125in Flange Length x 5.5in H
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$58.95
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K&N Universal Air Filter Chrome Round Tapered Red - 4in Flange ID x 1.125in Flange Length x 9.5in H K&N Universal Air Filter Chrome Round Tapered Red - 4in Flange ID x 1.125in Flange Length x 9.5in H
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K&N Universal Air Filter Chrome Round Tapered Red - 4in...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$55.95
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K&N Universal Chrome Filter Multi Lingual K&N Universal Chrome Filter Multi Lingual
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K&N Universal Chrome Filter Multi Lingual
K&N Universal Chrome Filter Multi Lingual
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$42.95
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K&N Universal Filter Chrome Round Tapered White - 4in Flange ID x 1.125in Flange Length x 5.5in H K&N Universal Filter Chrome Round Tapered White - 4in Flange ID x 1.125in Flange Length x 5.5in H
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K&N Universal Filter Chrome Round Tapered White - 4in Flange...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$33.95
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K&N Universal Air Filter Chrome Round Tapered Red - 4in ID x 1.125in L x 5.5in H (Multi Lingual) K&N Universal Air Filter Chrome Round Tapered Red - 4in ID x 1.125in L x 5.5in H (Multi Lingual)
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K&N Universal Air Filter Chrome Round Tapered Red - 4in...
K&N Universal Air Filter Chrome Round Tapered Red - 4in ID x 1.125in L x 5.5in H (Multi Lingual)
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$42.95
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K&N Universal Air Filter Chrome Round Tapered Red - 4in Flange ID x 1.125in Flange Length x 5.5in H K&N Universal Air Filter Chrome Round Tapered Red - 4in Flange ID x 1.125in Flange Length x 5.5in H
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K&N Universal Air Filter Chrome Round Tapered Red - 4in...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$33.95
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K&N Universal Air Filter Chrome Round Tapered Blue - 4in Flange ID x 1.125in Flange Length x 5.5in H K&N Universal Air Filter Chrome Round Tapered Blue - 4in Flange ID x 1.125in Flange Length x 5.5in H
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K&N Universal Air Filter Chrome Round Tapered Blue - 4in...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$33.95
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K&N Universal Clamp-On Air Filter 3-1/8in FLG / 4-15/16in B / 3-1/2in T / 4-3/8in H K&N Universal Clamp-On Air Filter 3-1/8in FLG / 4-15/16in B / 3-1/2in T / 4-3/8in H
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K&N Universal Clamp-On Air Filter 3-1/8in FLG / 4-15/16in B...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$59.95
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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 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 /...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$76.95
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K&N Universal Air Filter 6in Flange ID x 7.5in Base / 5in OD Top x 8in H K&N Universal Air Filter 6in Flange ID x 7.5in Base / 5in OD Top x 8in H
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K&N Universal Air Filter 6in Flange ID x 7.5in Base...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$55.95
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K&N Universal Rubber Filter 3 1/2inch ID FLG / 6inch Base / 4-5/8inch Top / 6inch Height K&N Universal Rubber Filter 3 1/2inch ID FLG / 6inch Base / 4-5/8inch Top / 6inch Height
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K&N Universal Rubber Filter 3 1/2inch ID FLG / 6inch...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$55.95
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K&N Universal Rubber Filter - Round Tapered 6in Base OD x 3in Flange ID x 6in H K&N Universal Rubber Filter - Round Tapered 6in Base OD x 3in Flange ID x 6in H
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K&N Universal Rubber Filter - Round Tapered 6in Base OD...
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications....
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$55.95
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