K&N E-4521

Replacement Filters > Replacement Industrial Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.5 out of 5 stars   4 Customer Reviews
List Price: $53.00
Your Price: USD $35.99

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The K&N E-4521 replacement air filter is constructed using an oil-free synthetic media. A tube of sealing grease is provided to help ensure an airtight seal. The E-4521 provides superior filtration, protecting your equipment's engine. This K&N air filter can be cleaned and used again. The E-4521 air filter fits some Kohler, Toro Multi Pro and John Deere equipment, in addition to other applications.

[More Information on Small Engine & Light Industrial Air Filters]
  • Washable and reusable
  • Ease of maintenance
  • High air flow with excellent filtration
  • Increased performance
  • Grease provided for secure fit
  • Lifetime limited warranty

Product Specifications

Air Filter ShapeRound
Filter MaterialNon-woven Synthetic
Height2.5 in (64 mm)
Inner WireNo
Inside Diameter5.5 in (140 mm)
Outside Diameter7 in (178 mm)
Package Contents1 Air Filter, 1 K&N 1oz Sealing Grease
Package Quantity1
Product Box Height7.75 in (197 mm)
Product Box Length7.75 in (197 mm)
Product Box Width4.13 in (105 mm)
Product StyleRound Air Filter
Top Material/FinishNone
Top StyleOpen
Weight0.9 lb (0.4 kg)

Product Reviews

Review part E-4521
Wednesday, October 22, 2014 - Part E-4521
I recently purchased a K and N filter for my 1974 wheelhorse c120 with an old Koher k301 cast iron engine on it, that I use for mowing, snow plowing and snow blowing in the winter. I got sick of paying out the nose each and every year for the OEM Kohler filters. So I installed my new K and N before mowing this past time. OH MY GOD. LOW END LIKE CRAZY. Like it never had before. Seems like once the governor kicks in it just PULLS through. Keeps the Rpms higher underload and overall it is just amazing that an air filter can do this to performance. Will I buy other K and N products absolutly. I am a small engine tech here in PA, I believe in keeping this older equipment running as long as possible and then some. I have a 3 other wheelhorses ranging in dates from the late 70-s to late 80s and a massy ferguson garden tractor that will definitely be getting a k and N  when the time comes. Another thing I noticed is it does not get near as dirty as my old oem filters with the old foam pre cleaners on them. Awsome product , and its awsome that you guys made it for such an old tractor like mine. Everyone wants the new cheapie stuff they sell at lowes and home depot, NOPE not me I like the good old garden tractors with so much torque they could climb a wall. I will defenetly be installing your filters on all my overhauls from now on no questions asked. Why throw money away in todays day and age?

Cody Frey
Boyertown, Pennsylvania
Sunday, June 22, 2014 - Part E-4521
Filter was easy to look up and determine which model to get. Item was packed well and shipped quickly. It fit my mower ok as expected. Have not been able to run it yet (while solving another fuel problem) to see if there is any noticeable performance difference.

Josef Stanek
Monday, November 18, 2013 - Part E-4521
Saves me lots of money on filters but would have been better with a foam prefilter as its on my mower and gets clogged by grass daily.

Wednesday, November 06, 2013 - Part E-4521
I have always had great results with your filters.

R Svedahl