$242.99 USD
MSRP $440.69 44.9% Off
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K&N 66-5090 Round Air Filter Assembly

Custom Assemblies > Round Air Filter Assembly
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   3.0 out of 5 stars   1 Customer Review
  • Most parts include a base, K&N filter, top plate, and stud
  • Designed to provide more air flow to the engine
  • Designed for engines with round air cleaner housings
  • High air flow with excellent filtration
  • Washable and reusable lifetime air filter
  • One year limited warranty
K&N Custom 66 Series® custom air cleaner assemblies are designed for use with any engine that uses a round element air cleaner housing. They incorporate our famous K&N Air Filters and provide serious air flow. Each complete assembly comes with base, element, top plate and stud.

[More Information on Custom 66 Series Air Cleaner Assemblies]

Available Information

Product Specifications

Air Filter ColorRed
Air Filter Height4 in (102 mm)
Air Filter Inside Diameter12 in (305 mm)
Air Filter MaterialCotton Gauze
Air Filter ShapeRound
Filter MaterialCotton Gauze
Inlet Diameter5.125 in (130 mm)
Mounting Hardware IncludedYes
Neck Flange5.125 in (130 mm)
Overall Height4.625 in (117 mm)
Product Box Height6.75 in (171 mm)
Product Box Length15.38 in (391 mm)
Product Box Width15.38 in (391 mm)
Product StyleCustom Assemblies
Replacement FilterE-3750
Size14 Inch
Style1-1/4" Drop Base
Top Material/FinishAluminum
Top Style5 Spoke Billet Aluminum
Weight9.8 lb (4.5 kg)

K&N 66-5090 Round Air Filter Assembly Product Reviews

Tuesday, March 14, 2017 - Part 66-5090
Great looking product, but it did not fit my application. ZZ454 with a Holley 750 carb under a C3 Corvette L88 hood. I had to return it.

Anthony Gaudlip
Canonsburg, Pennsylvania