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K&N E-3952 Air Filter

Replacement Filters > Rectangular Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.7 out of 5 stars   6 Customer Reviews
  • Designed to boost horsepower and rate of acceleration
  • Can be cleaned and used again
  • High air flow with exceptional filtration
  • Lasts up to 50,000 miles before cleaning is required depending on driving conditions
  • Works with original equipment manufacturer vehicle electronics
  • Emissions legal in all 50 US states
  • Will NOT void vehicle warranty
  • Million Mile Limited Warranty®
K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty and will be the last air filter your vehicle will ever need.

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Product Specifications

Filter MaterialCotton Gauze
Height2.5 in (64 mm)
Inside Length5.75 in (146 mm)
Inside Width3.5 in (89 mm)
Outside Length6.75 in (171 mm)
Outside Width4.5 in (114 mm)
Air Filter ShapeRectangular
Package Contents1 Air Filter
Package Quantity1
Product StyleRectangular Air Filter
Weight0.6 lb (0.3 kg)
Filter Re-Oiling Amount0.44 oz (13 ml)
Product Box Height7.25 in (184 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)

K&N E-3952 Air Filter Product Reviews

Thursday, June 1, 2017 - Part E-3952
Put this on my old '83 solid axle Toyota with a carbureted 22r in it. I literally gained 3 miles to the gallon and it'll pay for itself in about 12 tanks of gas.

Clayton Mincic
Fort Collins, Colorado
Monday, May 29, 2017 - Part E-3952
Best air filter on earth.

Roger W Roush II
Grove City, Ohio
Tuesday, January 10, 2017 - Part E-3952
I want to make a custom intake for my LS1. This filter is exactly what I was looking for to make a custom air intake.

Sam Jones
Pilesgrove, New Jersey
Friday, August 19, 2016 - Part E-3952
Still trying it out. Have it on a (Brand Name) intake manifold with Webber 38 on a 170 slant six mopar.

Jack Neitz
Frederick, Colorado
Tuesday, August 2, 2016 - Part E-3952
Excellent quality-best price anywhere.

John Dasovich
Marietta, California
Friday, January 15, 2016 - Part E-3952
The air filter fit exactly as needed... There wasn't any room for incorrect sizing.

Scott Phillips
DIllon, Montana