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K&N RU-2590 Universal Clamp-On Air Filter

Universal Air Filters > Universal Clamp-On Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   6 Customer Reviews
  • 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
  • One year limited warranty
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 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.

[More Information on Universal Air Filters]

Product Specifications

Air Filter ShapeRound Tapered
Filter MaterialCotton Gauze
Flange Inside Diameter4 in (102 mm)
Flange Length0.625 in (16 mm)
Flange TypeCentered
Height7 in (178 mm)
Base Outside Diameter5.375 in (137 mm)
Top Outside Diameter4.375 in (111 mm)
Top StyleRubber
Top MaterialNone
Package Contents1 Air Filter
Package Quantity1
Product StyleRound Tapered Universal Air Filter
Weight1.4 lb (0.6 kg)
Filter Re-Oiling Amount1.24 oz (37 ml)
Air Filter Large End Diameter5.375 in (137 mm)
Product Box Height11 in (279 mm)
Product Box Length6.38 in (162 mm)
Product Box Width6.38 in (162 mm)
Inner WireNo

K&N RU-2590 Universal Clamp-On Air Filter Product Reviews

Monday, March 21, 2016 - Part RU-2590
Filter works great on my 93 supercharged Mustang. Engine breathes well, gets all the air it wants. Great filter.

Long Island, New York
Wednesday, April 15, 2015 - Part RU-2590
A quality filter. Fits good, looks good, works good.

New Jersey
Thursday, January 29, 2015 - Part RU-2590
This is a replacement for my original K&N filter. The original one is approximately 2 1/2 longer, making for a very tight fit in the space required. This replacement has more wiggle room, something I wanted. Thank you very much K&N!! Mahalo.

Monday, January 12, 2015 - Part RU-2590
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

Monday, May 12, 2014 - Part RU-2590
Great filter, sounds great on the car .

Chris Cook
Friday, December 27, 2013 - Part RU-2590
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