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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
Click this thumbnail image of K&N Clamp-On Filter, Round, 1.25 FL, 3 OD x 3 H for product details

KN RU-0060 

K&N Clamp-On Filter, Round, 1.25 FL, 3 OD x 3 H

$31.99 Not In Stock
Click this thumbnail image of K&N Clamp-On Filter, Round, 1.25 Flange, 3 OD x 4 H for product details

KN RU-0070 

K&N Clamp-On Filter, Round, 1.25 Flange, 3 OD x 4 H

$31.99 Not In Stock
Click this thumbnail image of K&N Clamp-On Filter, Round, 1.68 Flange, 3 OD x 4 H for product details

KN RU-0200 

K&N Clamp-On Filter, Round, 1.68 Flange, 3 OD x 4 H

$33.99 In Stock
Click this thumbnail image of K&N Clamp-On Filter, Round, 1.68 Flange, 4 OD x 2 H for product details

KN RU-0260 

K&N Clamp-On Filter, Round, 1.68 Flange, 4 OD x 2 H

$34.99 In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.06 FL, 5.5 D x 3 H, Chrome Cap for product details

KN RA-056V 

K&N Clamp On Filter, Round, 2.06 FL, 5.5 D x 3 H, Chrome Cap

$49.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.125 FL, 3.5 OD, 6" H for product details

KN RD-0520 

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

$33.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.44 Flange, 3.5 OD x 4 H for product details

KN RU-0800 

K&N Clamp On Filter, Round, 2.44 Flange, 3.5 OD x 4 H

$32.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.44 Flange, 4.5 OD x 4 H for product details

KN RU-0830 

K&N Clamp On Filter, Round, 2.44 Flange, 4.5 OD x 4 H

$35.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.44 Flange, 4.5 OD x 5 H for product details

KN RU-0840 

K&N Clamp On Filter, Round, 2.44 Flange, 4.5 OD x 5 H

$39.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.44 FL, 5.5 OD x 3 H, 2 Offset for product details

KN RU-0870 

K&N Clamp On Filter, Round, 2.44 FL, 5.5 OD x 3 H, 2 Offset

$41.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.5 FL, 3.5 OD x 4" H for product details

KN RD-0700 

K&N Clamp On Filter, Round, 2.5 FL, 3.5 OD x 4" H

$32.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.5 FL, 3.5 OD x 5 H for product details

KN RD-0710 

K&N Clamp On Filter, Round, 2.5 FL, 3.5 OD x 5 H

$33.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.6 Flange, 4.5 OD x 4 H for product details

KN RU-2650 

K&N Clamp On Filter, Round, 2.6 Flange, 4.5 OD x 4 H

$37.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.68 Flange, 4.5 OD x 4 H for product details

KN RU-0900 

K&N Clamp On Filter, Round, 2.68 Flange, 4.5 OD x 4 H

$37.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.68 Flange, 4.5 OD x 5 H for product details

KN RU-0910 

K&N Clamp On Filter, Round, 2.68 Flange, 4.5 OD x 5 H

$39.99 In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.75 FL, 5.5 D x 3 H, .44 Offset for product details

KN RU-0940 

K&N Clamp On Filter, Round, 2.75 FL, 5.5 D x 3 H, .44 Offset

$41.99 Not In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 2.75 FL, 7 Dia x 7 H, 0.7 Offset for product details

KN RU-2940 

K&N Clamp On Filter, Round, 2.75 FL, 7 Dia x 7 H, 0.7 Offset

$48.99 In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 3 Flange, 5 OD x 3 H for product details

KN RU-2420 

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

$39.99 In Stock
Click this thumbnail image of K&N Clamp On Filter, Round, 3 Flange, 5 OD x 5 H for product details

KN RU-2430 

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

$41.99 Not In Stock
Click this thumbnail image of K&N Clamp-On Filter, Round, 3.5 Flange, 5 OD x 3 H for product details

KN RU-1790 

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

$38.99 In Stock