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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 Rubber Filter 3 1/2inch ID FLG / 6inch Base / 4-5/8inch Top / 9inch Height K&N Universal Rubber Filter 3 1/2inch ID FLG / 6inch Base / 4-5/8inch Top / 9inch 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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K&N Universal Rubber Filter 3inch FLG / 5inch OD-B / 4-5/8inch OD-T / 8inch H K&N Universal Rubber Filter 3inch FLG / 5inch OD-B / 4-5/8inch OD-T / 8inch H
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K&N Universal Rubber Filter 3inch FLG / 5inch OD-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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K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 14inch H K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 14inch H
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K&N Universal Rubber Filter 4inch FLG / 6inch OD-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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$76.95
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K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 9inch H K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 9inch H
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K&N Universal Rubber Filter 4inch FLG / 6inch OD-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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$63.95
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K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 12inch H K&N Universal Rubber Filter 4inch FLG / 6inch OD-B / 4-5/8inch OD-T / 12inch H
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K&N Universal Rubber Filter 4inch FLG / 6inch OD-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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$76.95
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K&N Universal Air Filter (4in. Flange / 6in. Base OD / 4-5/8in. Top OD / 6in. Height) 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...
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 3inch FLG / 6inch OD-B / 4-5/8inch OD-T / 9inch L K&N Universal Rubber Filter 3inch FLG / 6inch OD-B / 4-5/8inch OD-T / 9inch L
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K&N Universal Rubber Filter 3inch FLG / 6inch OD-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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K&N 2-3/8in Dual 9-1/8in X 5-1/2in 6-1/4in h K&N 2-3/8in Dual 9-1/8in X 5-1/2in 6-1/4in h
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K&N 2-3/8in Dual 9-1/8in X 5-1/2in 6-1/4in h
K&N Oval Style Stacks for Kinsler - Siamese Stacks - Air filters are designed for use with the Kinsler fuel injection system for Pontiac and...
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$72.95
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K&N Universal Air Filter 4in Flange ID 7in OD 9in Height K&N Universal Air Filter 4in Flange ID 7in OD 9in Height
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K&N Universal Air Filter 4in Flange ID 7in OD 9in...
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 Universal Air Filter - Round Straight 4in Flange ID x 7in OD x 6in Height K&N Universal Air Filter - Round Straight 4in Flange ID x 7in OD x 6in Height
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K&N Universal Air Filter - Round Straight 4in 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 Rubber Filter 2.5in Flange ID x 3.5in OD x 6in Height K&N Universal Rubber Filter 2.5in Flange ID x 3.5in OD x 6in Height
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K&N Universal Rubber Filter 2.5in Flange ID x 3.5in 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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$33.95
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K&N Universal Rubber Filter 2.5in Flange ID x 3.5in OD x 5in Height K&N Universal Rubber Filter 2.5in Flange ID x 3.5in OD x 5in Height
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K&N Universal Rubber Filter 2.5in Flange ID x 3.5in 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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$42.95
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K&N Universal Rubber Filter 2 1/2inch Flange 3 1/2inch OD 4 inch Height K&N Universal Rubber Filter 2 1/2inch Flange 3 1/2inch OD 4 inch Height
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K&N Universal Rubber Filter 2 1/2inch Flange 3 1/2inch 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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$42.95
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K&N 64mm Flg Id 118mm B Od 89mm T Od 151mm H K&N 64mm Flg Id 118mm B Od 89mm T Od 151mm H
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K&N 64mm Flg Id 118mm B Od 89mm T 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 Universal Chrome Filter 4.125in Flange ID x 7.375in Base OD x 7in Top OD x 11.5in Height K&N Universal Chrome Filter 4.125in Flange ID x 7.375in Base OD x 7in Top OD x 11.5in Height
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K&N Universal Chrome Filter 4.125in Flange ID x 7.375in 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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$160.95
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K&N Universal Apollo Black Cold Air Intake - 70mm OD FLG PP K&N Universal Apollo Black Cold Air Intake - 70mm OD FLG PP
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K&N Universal Apollo Black Cold Air Intake - 70mm OD...
K&N's APOLLO CIS is a universal "Cold Air Intake System". The Apollo's specially designed shape increases volumetric efficiency and is made of durable lightweight material...
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$210.95
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K&N Universal Chrome Filter GM TPI Custom - Oval Flange K&N Universal Chrome Filter GM TPI Custom - Oval Flange
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K&N Universal Chrome Filter GM TPI Custom - Oval 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 Chrome Filter 4 inch FLG / 5 3/8 inch Bottom / 4 1/2 inch Top / 8 inch Height K&N Universal Chrome Filter 4 inch FLG / 5 3/8 inch Bottom / 4 1/2 inch Top / 8 inch Height
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K&N Universal Chrome Filter 4 inch FLG / 5 3/8...
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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$84.95
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K&N Universal Chrome Filter 2.875in Flange ID / 5.188 Base OD / 3.5in Top OD / 4.438in Height K&N Universal Chrome Filter 2.875in Flange ID / 5.188 Base OD / 3.5in Top OD / 4.438in Height
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K&N Universal Chrome Filter 2.875in Flange ID / 5.188 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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$63.95
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K&N Universal Clamp-On Air Filter 2-7/16in Flange 4-1/2x3-3/4in Base 3x2in Top 6in Height K&N Universal Clamp-On Air Filter 2-7/16in Flange 4-1/2x3-3/4in Base 3x2in Top 6in Height
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K&N Universal Clamp-On Air Filter 2-7/16in Flange 4-1/2x3-3/4in Base 3x2in...
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 Clamp-On Air Filter 2-1/8in Flange 4in x 3in Base 3in x 2in Top 4in Length K&N Universal Clamp-On Air Filter 2-1/8in Flange 4in x 3in Base 3in x 2in Top 4in Length
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K&N Universal Clamp-On Air Filter 2-1/8in Flange 4in x 3in...
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 Clamp-On Air Filter / 2-1/8in O/S K&N Universal Clamp-On Air Filter / 2-1/8in O/S
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K&N Universal Clamp-On Air Filter / 2-1/8in O/S
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 Clamp-On Air Filter 2in FLG / 3-1/8in B / 2in T / 3in L K&N Universal Clamp-On Air Filter 2in FLG / 3-1/8in B / 2in T / 3in L
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K&N Universal Clamp-On Air Filter 2in FLG / 3-1/8in 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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$50.95
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K&N Universal Chrome Filter 1 1/8 inch FLG / 2 1/4 inch Bottom / 2 inch Top / 2.5 inch Height K&N Universal Chrome Filter 1 1/8 inch FLG / 2 1/4 inch Bottom / 2 inch Top / 2.5 inch Height
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K&N Universal Chrome Filter 1 1/8 inch FLG / 2...
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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$46.95
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