K&N RU-4180 | Air Filter

Part Number
Universal Clamp-On Air Filter

Fits: 04-06 Nissan Altima, 04-08 Nissan Maxima

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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 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.



  • Clamp-On Washable and Reusable Air Filter
  • Malleable Flanges
  • One Year Limited Warranty
  • Universal Clamp-on Air Filter
  • Regardless of the angle or offset diameter of an air intake| there is probably a K/N Universal air filter for your equipment. K/N universal air filters are washable and reusable.
  • Universal Clamp-On Air Filter
  • Designed To Increase Horsepower And Acceleration
  • High Air Flow With Excellent Filtration


Air Filter Large End Diameter6.000 in. (152mm)
Automotive Item GradeHigh Performance
Base Outside Diameter6.000 in. (152mm)
Filter MaterialCotton Gauze
Filter Re-Oiling Amount1.27 oz (38 ml)
Flange Angle0 Degree
Flange Inside Diameter3.000 in. (76mm)
Flange Length1.750 in. (44mm)
Flange Offset0.000 in. (0mm)
Flange TypeCentered
Frame DesignFlexible
Item Height6.000 in. (152mm)
Item Weight1.500 lbs. (0.7 kg)
Machine WashableYes
Number of Flanges1
Oil IncludedYes
Package Contents1 Air Filter
Package MaterialCorrugated
Package Quantity1
Package TypeBox
Prop 65 (C, R or CR)CR
Prop 65 Warning Labelhttps://www.knfilters.com/images/l/prop65.jpg
ShapeRound Tapered
TitleK&N RU-4180 Universal Clamp-On Air Filter
Top MaterialRubber
Top Outside Diameter4.500 in. (114mm)
Top StyleRubber
WARNING CA Proposition 65Yes
WARNING CA Proposition 65 MessageWARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Round Tapered| Base OD-6 in.| Top OD-4.5 in.| Flange ID-3 in./L-1.75 in.| H-6 in.| Centered| Rubber


  • 2004-2006 Nissan Altima
  • 2004-2008 Nissan Maxima
Customer Questions
Can K&N filters get wet?
No, K&N filters should not get wet.
When to clean K&N air filter?
K&N air filters should be cleaned approximately every 50,000 miles (80,000 kilometers) or as recommended by the manufacturer.
Will K&N filter increase mpg?
It is possible for a K&N air filter to slightly improve fuel efficiency (MPG) under certain conditions.
What does K&N mean?
K&N stands for the names of the two founders of the company, Ken Johnson and Norm McDonald.
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