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Air Filters -- Universal Clamp-On Mount, Round Straight

These clamp-on air filters have non-replaceable elements. Do not use K&N Sealing Grease on these filters.

How big an air filter do I need?
According to K&N, the recommended filter size is determined by the engine size and maximum RPM:

A = (CID x RPM) / 25,500
A = Effective filtering area
CID = Engine displacement in cubic inches (liters displacement x 61.02)
RPM = Maximum RPM

To determine the area of any of these straight-sided round filters, multiply the Diameter times the Height times pi:
A = D x H x 3.14

Image
Part No.
Description
Price
Status
K&N Clamp On Filter, Round, 2.125 FL, 3.5 OD, 6" H

KN RD-0520 

K&N Clamp On Filter, Round, 2.125 FL, 3.5 OD, 6" H

$46.99In Stock
K&N Clamp-On Filter, Round, 3.5 Flange, 5 OD x 3 H

KN RU-1790 

K&N Clamp-On Filter, Round, 3.5 Flange, 5 OD x 3 H

$49.99In Stock