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K&N E-9233 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   8 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 E-9233 Air Filter fits some Nissan D21 Pickup, Nissan D22 Pickup, Nissan Frontier, Nissan Pickup, and Nissan Xterra 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 ShapeTapered Conical
Base Inside Diameter10.438 in (265 mm)
Base Outside Diameter12.75 in (324 mm)
Filter MaterialCotton Gauze
Height2.5 in (64 mm)
Inner WireNo
Top Outside Diameter9.438 in (240 mm)
Top StyleRubber
Top MaterialNone
Package Contents1 Air Filter, 1 K&N 1oz Sealing Grease
Package Quantity1
Product StyleTapered Conical Air Filter
Outside Diameter12.75 in (324 mm)
Inside Diameter10.438 in (265 mm)
Weight1.9 lb (0.8 kg)
Filter Re-Oiling Amount1.48 oz (44 ml)
Air Filter Large End Diameter12.75 in (324 mm)
Product Box Height4.38 in (111 mm)
Product Box Length14.13 in (359 mm)
Product Box Width14.13 in (359 mm)

K&N E-9233 Air Filter Product Reviews

Tuesday, March 13, 2018 - Part E-9233
Works great. I installed it in a 2002 Nissan Frontier (230,000 miles) and noticed an immediate improvement. My engine used to turn 3000 rpm at 70 mph, now it turns at 2800 rpm. I have to cross a steep bridge every day and I used to have to gear down to fourth, but now I can stay in fifth gear and cross it with just a slight increase of throttle. I was so impressed that I bought a K&N filter for my mother's 2005 Expedition and also noticed better performance. I wish I would have done this sooner. Over the life of my vehicle, it would have saved me a lot of money in gas and put less strain on my engine and transmission.

Brian Dugan
Georgetown, South Carolina
Monday, February 5, 2018 - Part E-9233
Easy fit. Does exactly what you'd expect.

Paul Tuttle
Greenville, South Carolina
Wednesday, July 26, 2017 - Part E-9233
I have used K&N filters for my motorcycles and know they are very good. When I replaced my truck a/c, my fuel mileage went down by 20, after replacing the stock filter with a K&N my mileage increased by over 2 miles per gallon and a nice little power increase, not much but noticeable especially with the a/c on.

Terry Leland
Kailua Kona, Hawaii
Monday, June 26, 2017 - Part E-9233
I had low expectations about any performance improvements in my 96 nissan hardbody from a simple air filter upgrade. I had a grin on my face when I took it out for a city/highway road test. I noted a very obvious improvement in both throttle response and acceleration. Based on the milage from the half tank of fuel I had on hand, I anticipate an overall mpg improvement as well. Best 60 bucks I've ever spent on a vehicle.

Larry Gallagher
Jacksonville, Florida
Tuesday, April 21, 2015 - Part E-9233
Trucks runs better and has more power.

Michael Weyant
Springfield, Illinois
Wednesday, September 10, 2014 - Part E-9233
Purchased this a month after I bought my 2001 Nissan Frontier which now has 130K miles. Adds Torque and HP since I have an automatic transmission. Wash and clean this filter 3 times so far and still looks as good as the day I installed. I wash the filter every 35-40K miles to prolong the life of my engine as well as keeping this filter clean.

Thursday, July 17, 2014 - Part E-9233
Superior product! Got this for my 2003 Nissan Frontier with the KA24DE 2.4L I4 engine. Shipping was good, came in about a week from ordering. Installation was super-basic, no special tools or anything but the best thing was the performance gain. I could feel noticiable gain to both torque and HP. I believe this product will stand up to the Million Mile Warranty!

Madera, California