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K&N 33-2399 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.9 out of 5 stars   38 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 33-2399 Air Filter fits some Fiat Sedici, Infiniti EX35, Infiniti EX37, Infiniti G25, Infiniti G35, Infiniti G37, Infiniti Q40, Infiniti Q60, Infiniti QX50, Nissan 350Z, Nissan 370Z, Nissan Fairlady Z, Nissan Skyline 250GT, Nissan Skyline 350GT, Nissan Skyline 370GT, and Suzuki SX4 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)
Outside Length7.125 in (181 mm)
Outside Width6.625 in (168 mm)
Package Contents1 Air Filter
Package Quantity1
Product StylePanel Air Filter
Weight0.9 lb (0.4 kg)
Filter Re-Oiling Amount0.61 oz (18 ml)
Product Box Height9.69 in (246 mm)
Product Box Length7.72 in (196 mm)
Product Box Width1.75 in (44 mm)

K&N 33-2399 Air Filter Product Reviews

Friday, January 19, 2018 - Part 33-2399
Filters fit great on my 2015 infiniti Q40. No major complaints. There is a high pitched whine above 6500 rpm but I’m sure it’s a function of the stock air boxes and not the filters themselves. Very satisfied.

Andrew Hagerty
Kennett Square, Pennsylvania
Wednesday, August 30, 2017 - Part 33-2399
Great! No issues. Will definitely recommend and buy again.

Antonio Robles
Los Angeles, California
Tuesday, August 15, 2017 - Part 33-2399
If I could get a deal on an intake I might buy one. Thank you

Jim Banks
Aulac, Canada
Monday, July 31, 2017 - Part 33-2399
Great product, you can immediately feel the difference. I use K&N in all my cars.

William Jackson
Livermore, California
Thursday, July 20, 2017 - Part 33-2399
K&N still number on air filters. All my cars have one.

Joseph Cerqueira
Coram, New York
Monday, July 10, 2017 - Part 33-2399
Great filters, but most of all great service: The original package came shipped with a dent on the packaging box from UPS. I called K&N customer service and they offered to ship another one free of charge, no questions asked. It came a few days later perfect. Thank you K&N

Rick Gao
Friday, June 23, 2017 - Part 33-2399
Looks great in my car.

Michael Wirt
Vista, California