Air Filters

Replacement Air Filters
  • K&N® - 33 Series Panel Red Air Filter (10.625" L x 10" W x 0.875" H)
    K&N®33 Series Panel Red Air Filter (10.625" L x 10" W x 0.875" H) (33-2963)
    0
    # mpn4825780255
    33 Series Panel Red Air Filter (33-2963) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $74.99
  • K&N® - 33 Series Panel Red Air Filter (10.625" L x 4.875" W x 1.563" H)
    K&N®33 Series Panel Red Air Filter (10.625" L x 4.875" W x 1.563" H) (33-3007)
    0
    # mpn4825784007
    33 Series Panel Red Air Filter (33-3007) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $59.99
  • K&N® - 33 Series Panel Red Air Filter (10.625" L x 5.75" W x 1" H)
    K&N®33 Series Panel Red Air Filter (10.625" L x 5.75" W x 1" H) (33-2472)
    4
    # mpn4825779796
    33 Series Panel Red Air Filter (33-2472) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.625" L x 5.938" W x 1.563" H)
    K&N®33 Series Panel Red Air Filter (10.625" L x 5.938" W x 1.563" H) (33-5060)
    0
    # mpn4825781260
    33 Series Panel Red Air Filter (33-5060) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.625" L x 7.438" W x 1.438" H)
    K&N®33 Series Panel Red Air Filter (10.625" L x 7.438" W x 1.438" H) (33-2392)
    2
    # mpn4825780903
    33 Series Panel Red Air Filter (33-2392) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $74.99
  • K&N® - 33 Series Panel Red Air Filter (10.625" L x 8.406" W x 1.625" H)
    K&N®33 Series Panel Red Air Filter (10.625" L x 8.406" W x 1.625" H) (33-3134)
    0
    # mpn4825782092
    33 Series Panel Red Air Filter (33-3134) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $89.99
  • K&N® - 33 Series Panel Red Air Filter (10.688" L x 6.375" W x 1.063" H)
    K&N®33 Series Panel Red Air Filter (10.688" L x 6.375" W x 1.063" H) (33-2270)
    0
    # mpn4825781323
    33 Series Panel Red Air Filter (33-2270) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $54.99
  • K&N® - 33 Series Panel Red Air Filter (10.688" L x 6.625" W x 1.625" H)
    K&N®33 Series Panel Red Air Filter (10.688" L x 6.625" W x 1.625" H) (33-3073)
    0
    # mpn4825784077
    33 Series Panel Red Air Filter (33-3073) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.688" L x 8.625" W x 1.125" H)
    K&N®33 Series Panel Red Air Filter (10.688" L x 8.625" W x 1.125" H) (33-3079)
    0
    # mpn4825781313
    33 Series Panel Red Air Filter (33-3079) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.688" L x 9.156" W x 1.625" H)
    K&N®33 Series Panel Red Air Filter (10.688" L x 9.156" W x 1.625" H) (33-3136)
    0
    # mpn4825779788
    33 Series Panel Red Air Filter (33-3136) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $89.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 10" W x 1.063" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 10" W x 1.063" H) (33-5030)
    1
    # mpn4825781136
    33 Series Panel Red Air Filter (33-5030) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 10.25" W x 1.25" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 10.25" W x 1.25" H) (33-2428)
    0
    # mpn4825781226
    33 Series Panel Red Air Filter (33-2428) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $74.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 6.563" W x 0.813" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 6.563" W x 0.813" H) (33-2124)
    1
    # mpn4825784714
    33 Series Panel Red Air Filter (33-2124) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $74.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 6.656" W x 1.125" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 6.656" W x 1.125" H) (33-3111)
    0
    # mpn4825780944
    33 Series Panel Red Air Filter (33-3111) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $54.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 6.656" W x 1.813" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 6.656" W x 1.813" H) (33-5084)
    0
    # mpn4825779956
    33 Series Panel Red Air Filter (33-5084) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 7.125" W x 1.188" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 7.125" W x 1.188" H) (33-2480)
    2
    # mpn4825781876
    33 Series Panel Red Air Filter (33-2480) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.75" L x 7.313" W x 1.5" H)
    K&N®33 Series Panel Red Air Filter (10.75" L x 7.313" W x 1.5" H) (33-3133)
    0
    # mpn4825779983
    33 Series Panel Red Air Filter (33-3133) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $74.99
  • K&N® - 33 Series Panel Red Air Filter (10.781" L x 6.813" W x 1" H)
    K&N®33 Series Panel Red Air Filter (10.781" L x 6.813" W x 1" H) (33-3034)
    0
    # mpn4825781098
    33 Series Panel Red Air Filter (33-3034) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.813" L x 7.313" W x 1.125" H)
    K&N®33 Series Panel Red Air Filter (10.813" L x 7.313" W x 1.125" H) (33-2293)
    0
    # mpn4825780351
    33 Series Panel Red Air Filter (33-2293) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.813" L x 7.625" W x 1.063" H)
    K&N®33 Series Panel Red Air Filter (10.813" L x 7.625" W x 1.063" H) (33-2484)
    0
    # mpn4825781867
    33 Series Panel Red Air Filter (33-2484) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $149.99
  • K&N® - 33 Series Panel Red Air Filter (10.875" L x 10.25" W x 1.188" H)
    K&N®33 Series Panel Red Air Filter (10.875" L x 10.25" W x 1.188" H) (33-2017)
    0
    # mpn4825784546
    33 Series Panel Red Air Filter (33-2017) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $74.99
  • K&N® - 33 Series Panel Red Air Filter (10.875" L x 7" W x 1.563" H)
    K&N®33 Series Panel Red Air Filter (10.875" L x 7" W x 1.563" H) (33-5089)
    1
    # mpn4825782185
    33 Series Panel Red Air Filter (33-5089) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.875" L x 7.125" W x 1" H)
    K&N®33 Series Panel Red Air Filter (10.875" L x 7.125" W x 1" H) (33-2397)
    1
    # mpn4825780107
    33 Series Panel Red Air Filter (33-2397) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $99.99
  • K&N® - 33 Series Panel Red Air Filter (10.875" L x 7.188" W x 1.5" H)
    K&N®33 Series Panel Red Air Filter (10.875" L x 7.188" W x 1.5" H) (33-5063)
    0
    # mpn4825782900
    33 Series Panel Red Air Filter (33-5063) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (10.875" L x 9.375" W x 2.375" H)
    K&N®33 Series Panel Red Air Filter (10.875" L x 9.375" W x 2.375" H) (33-5024)
    0
    # mpn4825782619
    33 Series Panel Red Air Filter (33-5024) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $89.99
  • K&N® - 33 Series Panel Red Air Filter (10.938" L x 7.5" W x 1" H)
    K&N®33 Series Panel Red Air Filter (10.938" L x 7.5" W x 1" H) (33-5031)
    0
    # mpn4825781506
    33 Series Panel Red Air Filter (33-5031) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (11" L x 10.031" W x 2.25" H)
    K&N®33 Series Panel Red Air Filter (11" L x 10.031" W x 2.25" H) (33-5005)
    0
    # mpn1956857
    33 Series Panel Red Air Filter (33-5005) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $119.99
  • K&N® - 33 Series Panel Red Air Filter (11" L x 6.25" W x 0.875" H)
    K&N®33 Series Panel Red Air Filter (11" L x 6.25" W x 0.875" H) (33-2343)
    0
    # mpn4825780075
    33 Series Panel Red Air Filter (33-2343) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (11" L x 6.563" W x 1.063" H)
    K&N®33 Series Panel Red Air Filter (11" L x 6.563" W x 1.063" H) (33-2232)
    1
    # mpn4825780788
    33 Series Panel Red Air Filter (33-2232) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $64.99
  • K&N® - 33 Series Panel Red Air Filter (11" L x 6.563" W x 1.063" H)
    K&N®33 Series Panel Red Air Filter (11" L x 6.563" W x 1.063" H) (33-2075)
    0
    # mpn4825779702
    33 Series Panel Red Air Filter (33-2075) by K&N®. K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. K&N makes over 1,200 different replacement air filters for the...
    Designed to boost horsepower and rate of accelerationCan be cleaned and used again
    $54.99




Breathing air that contains dust, soot, and other types of particulate matter can make you sick, and prolonged exposure can cause respiratory and cardiovascular disease. That’s why you should always wear an appropriate dust mask or respirator to protect yourself when doing jobs where you’re exposed to such contaminants. The same holds true for the engine in your car, truck, or SUV. If there was nothing to stop dirt and debris from entering the engine, serious damage and eventual total engine failure would result. Your vehicle comes equipped with an engine air filter, to trap dirt and debris and keep them from harming your engine. However, as the filter does its job, dirt and debris build up on the filter surface, and could eventually reach the point where airflow is restricted, reducing performance and fuel economy. To ensure optimal filtration and engine protection and performance, the air filter must be periodically replaced, and when you’re due for a new one, you’ll find the right filter for the job right here on our digital shelves.

Unlike people, who can choose when and where to wear a mask or respirator, an engine must always be protected with an air filter. That’s because a typical engine consumes huge quantities of air, as much as 10,000 gallons for every one gallon of gasoline, and it must ingest this air under all kinds of driving conditions. As you drive down the road, air that contains dirt, dust, sand, debris, leaves and other organic matter, and particulate from exhaust, goes into your vehicle’s air intake system. The air filters we offer protect your engine by trapping contaminant particles as small as 5 microns, which is 5 millionths of a meter or less than 1/10th the size of a human hair.

Our replacement air filters provide effective protection against this type of expensive damage without restricting airflow that would negatively affect engine performance and fuel efficiency. A typical original equipment spec air filter is made of paper, essentially wood pulp fibers that are bonded together and formed into pleats. Extremely small irregular passages in the filter trap the dirt. But since these passages also provide the pathway for air to flow into the engine, as dirt collects the passages can become restricted, reducing airflow. Our replacement air filters are designed and sized to provide the required level of filtration and airflow throughout the replacement interval specified in your owner’s manual if the vehicle is driven under normal conditions. However, if you regularly drive off-road, on unimproved roads, or in dusty conditions, you should regularly inspect your air filter as it may require more frequent replacement under those conditions.

We offer air filters for gasoline and diesel engines and for carbureted and fuel injected vehicles. Although filter shape will vary according to make and model, in general the air filters for carbureted engines are round and they’re located in a housing that mounts to the top of the carburetor. Most fuel injected vehicles have a flat panel air filter that’s located inside an air box mounted remotely from the engine. A duct connects the air filter housing to the throttle body and intake manifold. Air filter replacement is one of the easiest DIY jobs. A carburetor air filter is generally accessed by removing a wing nut and the air cleaner lid. On a fuel injected vehicle, the housing can be opened for filter removal by removing a few clips or screws. Before installing the new air filter, remove any debris that may have accumulated in the housing. When installing the new filter, make sure it seals properly against the housing, so all intake air goes through the filter. On fuel injected vehicles, inspect the air intake duct to make sure there are no cracks, gaps, or other openings where unfiltered air could enter the intake airstream.

Replacing the original equipment air filter is one of the easiest and least expensive things you can do to get more performance and economy from your car or truck. No matter what you drive, we have direct fit performance air filters that will install right in your vehicle’s factory air box. Our performance filters increase air flow, enabling your engine to make more power and get better fuel economy, and provide the critical filtration needed for engine protection. The filtering element in a performance air filter is constructed from cotton gauze, and/or a combination of proprietary synthetic materials, which allow much better air flow. And unlike the paper filter that collects dirt at the surface, performance filters trap dirt throughout the depth of the filtering element. As a result, you get consistently better air flow during the filter’s entire service interval, without any sacrifice in filtration ability. The service interval for a performance air filter is also far longer than a typical OE filter, as much as 50,000 miles. When service time rolls around, the only thing you need to do is clean your performance air filter, re-oil it if required, and put it back into service.

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Air Filters Reviews

426 reviews
I've always liked K&N, but lately their products have been less than desirable. I ordered this product with missing parts. It says in the install instructions that there are supposed to be 2 washers to secure it to the factory airbox. These were not included upon it's arrival to my doorstep. So I had to instead go to a hardware store and get the appropriate 8x32 washers/screws to complete the install. You get 3 stars due to brand loyalty, otherwise you'd only get 1.
Posted by Andrew (South Lake Tahoe, CA) / July 03, 20222014 Audi S4
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