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Part number: RU-1820
Universal product
Product Details
Universal Oval Tapered Air Filter
Products specifications
Air Cleaner Top Style Rubber
Air Filter Bottom Measurement 4.000 in. L x 3.000 in. W
Air Filter Shape Oval Straight
Air Filter Style Conical
Air Filter Top Measurement 3.500 in. L x 2.500 in. W
Base OD 3in(76mm)
Base OD(MA) 4in(102mm)
Base Outside Length 4 in (102 mm)
Base Outside Width 3 in (76 mm)
Filter Color Red
Filter Material Cotton gauze
Filter Re-Oiling Amount 0.2 oz (6 ml)
Flange Angle 0 degrees
Flange Center to Center 0 in (0 mm)
Flange Diameter 2in(51mm)
Flange Inside Diameter 2 in (51 mm)
Flange Length 0.625in(16mm)
Flange Offset 0.5in(13mm)in
Flange Type Offset
Flanges 1
Footnote 1 Base Has 1-1/8" Vent
Height 2.75 in (70 mm)
Inlet Flange Inside Diameter (in) 2.000 in.
Inner Wire No
Length 2.75in(70mm)
Length (in) 2.750 in.
Notes With offset inlet flange.
Package Contents 1 Air Filter
Package Quantity 1
Product Style Oval Tapered Universal Air Filter
Quantity Sold individually.
Top Material/Finish None
Top OD 2.5in(64mm)
Top OD(MA) 3.5in(89mm)
Top Outside Length 3.5 in (89 mm)
Top Outside Width 2.5 in (64 mm)
Weight 0.5 lb (0.2 kg)
Comments Legal in California ONLY for racing vehicles which may NEVER be used upon a highway Package Quantity

K&N Custom Air Filters can increase horsepower up to 12%. They are available in a wide range of sizes, designs and
shapes for virtually every application. K&N Custom Clamp On Air Filters are usually not used with OEM air boxes because of their larger than OEM size. They allow considerably more air flow than a stock air box set-up. Generally up to 25% increase in jet sizes will be required because of K&N filters increased air flow. K&N Clamp on Filters are not street legal.


  • When selecting one of K&Ns universal oval tapered air filters, you should consider the following dimensions as they relate to the specification chart:
  • Mounting Flange Inside Diameter - This is the most critical dimension and should be very close to the diameter of the applications inlet flanges. The flanges will stretch up to 1/8in. for those in-between sizes.
  • Filter Oval Dimensions - This is the length and width of the filter. Always use the largest filter practical to fit the application.
  • Filter Length - This dimension is the length of the filter body only, it does not include the flange length. Always use the longest filter practical, for maximum filtration.
  • Flange Angle and/or Length - If no angle is listed in the specifications table, the flange is straight. Any angle listed is in degrees and can be utilized when space is a problem.
  • Flange Type - The location of the flange in relation to the outside diameter of the filter is sometimes offset to one edge of the filter for more clearance.
  • These filters are legal ONLY for racing vehicles. Not applicable, not intended for use on emission controlled street or highway vehicles.
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Easy to navigate
Processing and shipping seemed to take awhile
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Great company to do business with!  Ordered a Thule 916XTR bike rack for my car and their prices blew away everyone else on the 'net!  Ordered on Sunday, they shipped on Monday and sent me a tracking number that night.  Super fast shipping and great communication! I'll definitely be coming back to Autoplicity again!
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Trustworthy seller. This is my second order. Got it quickly. good job!
K
Super fast shipping, easy to use site, would buy again from site
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