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K&N RU-2590 5.0 out of 5 stars 3 Customer Reviews
Universal Air Filters > Universal Rubber Filter

List Price: $67.77
Your Price: $46.99

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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. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16" (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.

[More Information on Universal Air Filters]
  • Designed to increase horsepower and acceleration
  • Hundreds of sizes and shapes for most applications
  • High air flow with excellent filtration
  • Clamp-on washable and reusable air filter
  • Malleable flanges
  • Not legal for highway use in states adopting California emission regulations
  • One year limited warranty

Product Specifications

Air Filter Large End Diameter:5.375 in (137 mm)
Air Filter Shape:Round Tapered
Base Outside Diameter:5.375 in (137 mm)
Filter Material:Cotton Gauze
Filter Re-Oiling Amount:1.24 oz (37 ml)
Flange Inside Diameter:4 in (102 mm)
Flange Length:0.625 in (16 mm)
Flange Type:Centered
Height:7 in (178 mm)
Inner Wire:No
Package Contents:1 Air Filter
Package Quantity:1
Part Number:RU-2590
Product Box Height:11 in (279 mm)
Product Box Length:6.38 in (162 mm)
Product Box Width:6.38 in (162 mm)
Product Style:Round Tapered Universal Air Filter
Top Material/Finish:None
Top Outside Diameter:4.375 in (111 mm)
Top Style:Rubber
Weight:1.4 lb (0.6 kg)

Product Reviews

 Aloha from Hawaii. This RU-2590 is a replacement for the one which is in my '97 dodge Dakota. Original one that came with the K&N cold air system is 8 3/4 long, it just barely fits in the assigned location, very tight. So, this one is 6 long, should fit with ease. Both are cone type with a 4 opening to fit the cold air intake. I've had the original one for over 14 Years...Nothing wrong with it, just wanted to have a shorter one so I don't have to struggle every time I service the filter. I service the filter twice a Year. Mahalo
Mike, Hawaii
 Great filter, sounds great on the car .
Chris Cook, Wisconsin
 I have been using your RU-2590 universal filter on a 2000 Ford F-350 with the 7.3L diesel for many years. It seemed small for the application but it has worked fine. I am getting over 20 MPG (with other mods. also)so it's size has not restricted air flow. Diesel filters do require much more frequent cleaning than advertised - in my experience every 3,000 miles or monthly, especially if I have driven through rain. The rain washes the oil (and dirt) from the filter right into the intake and the turbocharger. I have been able to minimize this somewhat by using drychargers for the last 3 or 4 years. They do stop fines from entering into the filter element somewhat. During a recent replacement of glow plugs and a turbo rebuild at 370,649 miles, no wear was apparent within the turbocharger. I have used a 1 micron bypass filter and [brand] synthetic additive (2 oz./QT of oil every 30,000 miles) since approximately 11,000 miles so this has apparently contributed to the low or minimal wear (the magnetic drain plug is almost clean at oil changes). The only other thing I have noticed is that after 2+ years or 20 or so filter cleanings the rubber flange of the filters shrink a bit, become harder and will no longer fit on the 4 intake. I think I read K & N recommends +/- 25 cleanings before replacement anyway though.
Dean Phelps, Ohio