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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 Oval Air Filter - 8-7/8in L 5-1/4in W 6in H K&N Oval Air Filter - 8-7/8in L 5-1/4in W 6in H
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K&N Oval Air Filter - 8-7/8in L 5-1/4in W 6in...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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K&N Oval Drop In Air Filter - 8.785in x 5.25in / 4.5in H K&N Oval Drop In Air Filter - 8.785in x 5.25in / 4.5in H
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K&N Oval Drop In Air Filter - 8.785in x 5.25in...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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K&N Oval Air Filter - 8-7/8in L 5-1/4in W 3-1/4in H K&N Oval Air Filter - 8-7/8in L 5-1/4in W 3-1/4in H
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K&N Oval Air Filter - 8-7/8in L 5-1/4in W 3-1/4in...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$55.95
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K&N Filter Universal Round Filter 7.75in OD x 6.25in ID x 2.5in H K&N Filter Universal Round Filter 7.75in OD x 6.25in ID x 2.5in H
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K&N Filter Universal Round Filter 7.75in OD x 6.25in ID...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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K&N Custom Air Filter 7in OD X 5 1/2in ID x 2in H K&N Custom Air Filter 7in OD X 5 1/2in ID x 2in H
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K&N Custom Air Filter 7in OD X 5 1/2in ID...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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K&N 7in od 5-3/16inid 3-3/4in h K&N 7in od 5-3/16inid 3-3/4in h
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K&N 7in od 5-3/16inid 3-3/4in h
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$44.95
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K&N Round Air Filter 7in OD 5.188in ID 3 Height K&N Round Air Filter 7in OD 5.188in ID 3 Height
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K&N Round Air Filter 7in OD 5.188in ID 3 Height
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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K&N Filter Universal Round Air Filter 6.25in. Outer Diameter K&N Filter Universal Round Air Filter 6.25in. Outer Diameter
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K&N Filter Universal Round Air Filter 6.25in. Outer Diameter
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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K&N Custom Air Filter - Round 6.25in OD 5.25in ID 4in H K&N Custom Air Filter - Round 6.25in OD 5.25in ID 4in H
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K&N Custom Air Filter - Round 6.25in OD 5.25in ID...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$55.95
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K&N Custom Air Filter - Round 6.25in OD 5.25in ID 3.25in H K&N Custom Air Filter - Round 6.25in OD 5.25in ID 3.25in H
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K&N Custom Air Filter - Round 6.25in OD 5.25in ID...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$67.95
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K&N Custom Air Filter 6.25in OS Width / 9.688in OS Length / 2.188in Height K&N Custom Air Filter 6.25in OS Width / 9.688in OS Length / 2.188in Height
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K&N Custom Air Filter 6.25in OS Width / 9.688in OS...
The K&N replacement air filter for RK Series air cleaner assemblies is designed to increase horsepower and acceleration while providing excellent filtration. The air filter...
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$67.95
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K&N Custom Filter Oval Length 6.125in I/S /7in O/S x Width 3.625in I/S/ 4.5in O/S x Height 1.75in K&N Custom Filter Oval Length 6.125in I/S /7in O/S x Width 3.625in I/S/ 4.5in O/S x Height 1.75in
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K&N Custom Filter Oval Length 6.125in I/S /7in O/S x...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$46.95
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K&N Universal Round Air Filter 6-3/8in OD 5in ID 2-1/2in Height K&N Universal Round Air Filter 6-3/8in OD 5in ID 2-1/2in Height
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K&N Universal Round Air Filter 6-3/8in OD 5in ID 2-1/2in...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$55.95
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K&N Custom Air Filter Round 4.625in ID / 6in OD / 2.5in Height K&N Custom Air Filter Round 4.625in ID / 6in OD / 2.5in Height
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K&N Custom Air Filter Round 4.625in ID / 6in OD...
K&N's high-flow air filters are available as a replacement for your stock motorcycle air filter element. They are custom engineered to fit your specific application...
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K&N S&S FILTER 6in OD x 4-5/8in ID x 2-3/16in H Replacement Filter for Harley Davidson K&N S&S FILTER 6in OD x 4-5/8in ID x 2-3/16in H Replacement Filter for Harley Davidson
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K&N S&S FILTER 6in OD x 4-5/8in ID x 2-3/16in...
The K&N E-3225 fits some Screaming Eagle intakes with a standard teardrop housing. This filter is designed to provide low restriction and increased performance, while...
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K&N Custom Air Filter Round 5-7/8in OD x 4-7/8in ID x 1.4/5in H K&N Custom Air Filter Round 5-7/8in OD x 4-7/8in ID x 1.4/5in H
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K&N Custom Air Filter Round 5-7/8in OD x 4-7/8in ID...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$46.95
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K&N 5-7/8in od4-1/2inid3-1/2in h K&N 5-7/8in od4-1/2inid3-1/2in h
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K&N 5-7/8in od4-1/2inid3-1/2in h
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$41.95
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K&N Custom Air Filter Round 5-3/8in OD x 4in ID x 2in H K&N Custom Air Filter Round 5-3/8in OD x 4in ID x 2in H
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K&N Custom Air Filter Round 5-3/8in OD x 4in ID...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$42.95
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K&N 5in od 3-3/4inid 3-9/16in h K&N 5in od 3-3/4inid 3-9/16in h
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K&N 5in od 3-3/4inid 3-9/16in h
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$39.95
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K&N Custom Air Filter Round 2.875in ID x 3.875in OD x 2in Height K&N Custom Air Filter Round 2.875in ID x 3.875in OD x 2in Height
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K&N Custom Air Filter Round 2.875in ID x 3.875in OD...
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed...
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$55.95
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K&N 54 Series Filter Element 54-5000 K&N 54 Series Filter Element 54-5000
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K&N 54 Series Filter Element 54-5000
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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$126.95
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K&N Replacement Element for RK-3929 Custom Air Filter K&N Replacement Element for RK-3929 Custom Air Filter
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K&N Replacement Element for RK-3929 Custom Air Filter
The K&N replacement air filter for RK Series air cleaner assemblies is designed to increase horsepower and acceleration while providing excellent filtration. The air filter...
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$84.95
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K&N Custom Air Filter Cotton Gauze 14inOD x 12 1/4inID x 2inH K&N Custom Air Filter Cotton Gauze 14inOD x 12 1/4inID x 2inH
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K&N Custom Air Filter Cotton Gauze 14inOD x 12 1/4inID...
This K&N racing air filter is made with 2 layers of cotton and does not come oiled. It was designed to provide even lower air...
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$67.95
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K&N 14in od 12-1/4inid 3-3/4in h K&N 14in od 12-1/4inid 3-3/4in h
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K&N 14in od 12-1/4inid 3-3/4in h
This K&N racing air filter is made with 2 layers of cotton and does not come oiled. It was designed to provide even lower air...
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$52.95
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