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K&N 33-2478 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.8 out of 5 stars   22 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®
The K&N 33-2478 Air Filter fits some Nissan Altima models. See vehicle applications link for details.
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.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Height1 in (25 mm)
Package Contents1 Air Filter
Package Quantity1
Product StyleUnique Air Filters
Outside Length11.438 in (291 mm)
Outside Width11.375 in (289 mm)
Weight1.6 lb (0.7 kg)
Filter Re-Oiling Amount1.3 oz (39 ml)
Product Box Height14 in (356 mm)
Product Box Length12.25 in (311 mm)
Product Box Width1.75 in (44 mm)

K&N 33-2478 Air Filter Product Reviews

Wednesday, February 28, 2018 - Part 33-2478
This is my 3rd factory replacement drop in filter for various vehicles. Fit, finish and quality have always been top notch with these filters. While I’ve never noticed much noticeable jump in power or gas mileage, these filters will definitely save you money in long run with being able to clean and reuse them.

Nathan Schuetz
Venedy, Illinois
Tuesday, February 27, 2018 - Part 33-2478
Fits great.

Tim Lenahan
Clovis, California
Wednesday, October 18, 2017 - Part 33-2478
K&N is the ONLY way to go when it comes to air filters.

Gregory James Davidson
McKinney, Texas
Monday, July 31, 2017 - Part 33-2478
Definitely an increase in HP and MPG.

Kwame McDonald
Charlotte, North Carolina
Thursday, July 27, 2017 - Part 33-2478
Love it!

Vincent Route
San Diego, California
Wednesday, June 21, 2017 - Part 33-2478
Arrived on time. no issues with shipping. Good packing. Easy Installation. Lets see how it turns out. Overall satisfied with what I got.

Vishal Mistry
Tampa, Florida
Friday, August 19, 2016 - Part 33-2478
I notice a small bit of horsepower change but not much. Gas mileage is a little bit better and it has quieted down the engine upon exceleration. I like it.

Levin Bailey-Donaldson III
Salisbury, Maryland