K&N RU-5090 Universal Clamp-On Air Filter

Universal Air Filters / Universal Clamp-On Air Filter
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$52.99 USD
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Product Overview

  • 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]
Air Filter ShapeRound Tapered
Filter MaterialCotton Gauze
Flange Inside Diameter2.75 in (70 mm)
Flange Length0.813 in (21 mm)
Flange TypeCentered
Height5.563 in (141 mm)
Base Outside Diameter3.75 in (95 mm)
Top Outside Diameter4 in (102 mm)
Top StyleRubber
Top MaterialNone
Package Contents1 Air Filter
Package Quantity1
Warranty1 Year Limited
Product StyleRound Tapered Universal Air Filter
Base Outside Length4.75 in (121 mm)
Base Outside Width3.75 in (95 mm)
Weight0.8 lb (0.3 kg)
Filter Re-Oiling Amount0.79 oz (23 ml)
Air Filter Large End Diameter4 in (102 mm)
Product Box Height7.25 in (184 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)
WARNING: Cancer and reproductive

K&N RU-5090 Universal Clamp-On Air Filter Product Reviews

Sunday, February 4, 2018 - Part RU-5090
A very good friend of mine has a beautiful 2002 Caterham and he very kindly lends me the vehicle it has a 1800 cc K series Rover engine putting out roughly 160 bhp. As the car needed a new air filter and as I have fitted K&N filters to all my cars and Suzuki GSXR 750, I thought I would see if I could get a filter to fit this vehicle. Although K&N filters do not specifically list a filter for this engine I was able to find a universal air filter with the great help of Samantha from K&N . The filter was a RU 5090 it has a 70mm flange inside diameter, the base size is 121 mm by 95 mm and if you fit the filter with the121 mm horizontal it just clears the throttle switch and with the 95 mm being vertical it does not kiss the bonnet. The RU 5090 filter will handle I believe over 220 bhp so it easily handles this engine, I did see quite a difference not only when you open the bonnet the engine sound was totally different and healthier, the response of the vehicle was much improved it seems to get through the gears and much quicker. I have been are fully qualified Motor technician for over 40 years so it is not a unqualified opinion ,many thanks K&N filters . Chris Noton, Bath.

Chris Noton
Bath, United Kingdom
Wednesday, May 11, 2016 - Part RU-5090
Filter does exactly as described. Fitting it is simple, greatly improved noise and small change in accelerator response.

Glasgow, England