K&N Universal 4.625" Cone Air Filter 3.5" Inside Diameter (RU-3550)

K&N Filters
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K&N Universal 4.625" Cone Air Filter

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.


  • Designed to increase horsepower and acceleration
  • Hundreds of sizes and shapes for most applications
  • High air flow with excellent filtration
  • Flange Inside Diameter: 3.5 in (89 mm)
  • Air Filter Large End Diameter: 4.625 in (117 mm)


  • Clamp-on washable and reusable air filter
  • Malleable flanges


  • Universal

What's in the Box?

  • Cone Filter


  • One year limited manufacturer warranty

Customer Reviews

Based on 8 reviews
Steven G Kuznecow
Breathe Better

All the bolt-ons and love. Why not let your baby breathe well. Easiest to install.

K&n Filter

Great Filter and fits well. Happy to replace fake types being floated around in my region.

Socal fk8
Perfect fit for it’s location

Had to have the smallest base 5” and smallest top diameter with a 4” id inlet to fit in this location with a 4” 45 degree aluminum elbow to clear the accessory wheel/belt underneath.

great product

worked for my ets intake pipe

K & N RF-1047 Filter

Bought this as an additional/replacement filter for my K & N intake system on my Evo X. It's good to have two so you can reinstall while the other filter is drying from the cleaning process. Can't go wrong with K & N. Highly recommend.