K&N E-4790

Replacement Filters > Replacement Industrial Air Filter
List Price: $77.50
Your Price: USD $52.99

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The K&N E-4790 replacement air filter is designed to increase horsepower and acceleration by reducing restriction and increasing air flow to your engine. The E-4790 is made with layers of woven cotton that offer outstanding filtration and can be washed and reused repeatedly. K&N replacement air filters can go up to 50,000 miles before cleaning is required, depending on driving conditions. The E-4790 is easy to install and is custom designed to fit right into the factory air box of select older Ford models and IMPCO industrial engines, as well as other applications.

[More Information on Small Engine & Light Industrial Air Filters]
  • Designed to increase horsepower and acceleration
  • Works with factory vehicle electronics
  • High air flow with excellent filtration
  • Washable and reusable air filter
  • Easy to install

Product Specifications

Air Filter ShapeRound
Filter MaterialCotton Gauze
Filter Re-Oiling Amount1.55 oz (46 ml)
Height2.75 in (70 mm)
Inner WireNo
Inside Diameter7.375 in (187 mm)
Outside Diameter10 in (254 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height10.31 in (262 mm)
Product Box Length10.19 in (259 mm)
Product Box Width3.94 in (100 mm)
Product StyleRound Air Filter
Top Material/FinishNone
Top StyleOpen
Weight1.7 lb (0.8 kg)

Customer Feedback

Outstanding products. Purchase two K&N filters, one for my 2008 Gmc Sierra and one for a 2008 Ford Mustang GT. Noticed an immediate increase in horsepower. Thank you.

Joseph Wilson
United States
Used this and still using on 2005 GMC Sierra 5.3l base model. Increased mileage 2.1 normal driving, 1.1 mile heavy foot driving. Also engine sounded smoother at idle and smoother acceleration. Have used with Ford ,Nissan and Isuzu, all with a same effect.

Ron Mcneal
Lewisville, Texas
I have always used these filters but recently rebuilt my Ford Capri 3.0 ghia and took the oval filter off to put a paper hotrod style filter on, it looked the part but I wanted a K&N so came to this site ( and took just 5mins to order an insert and it got there the next day, I wish every part I've ordered online was this quick and easy.

S. Wales, United Kingdom