Replacement Air Filter
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K&N Replacement Air Filter

Part No. 33-2399 Warranty Details  

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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.

Product Features:
  • This is the last air filter your vehicle will ever need!
  • 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┬«
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Height:1 in
Material:Cotton Gauze
Outside Length:7.125 in
Outside Width:6.625 in
Shape:Panel

REVIEW SNAPSHOT®

by PowerReviews
K&NReplacement Air Filter
 
4.5

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (1)

78%

of respondents would recommend this to a friend.

Pros

  • Durable (8)
  • High-performance (8)
  • Easy to use (7)

Cons

No Cons

Best Uses

  • Large cars (5)
  • Small cars (5)
  • Trucks (5)
    • Reviewer Profile:
    • Auto enthusiast (5)
    • Was this a gift?:
    • No (6)

Most Liked Positive Review

 

As expected

Easy- straight "drop in" fit.
Wife's car, made her do it - still married!!!

Easy- straight "drop in" fit.
Wife's car, made her do it - still married!!!

VS

Most Liked Negative Review

 

Leaks oil in the engine. Stay away!

The K&N filter was fine for a few months, but then the car started stalling and finally the check engine light came on. It turned out the air filters were leaking oil...Read complete review

The K&N filter was fine for a few months, but then the car started stalling and finally the check engine light came on. It turned out the air filters were leaking oil and screwing with the intake sensors. Ditched them for OEM and never had any issues again. Not worth it!

Reviewed by 10 customers

Displaying reviews 1-10

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5.0

Great product

By 

from Richmond Va

About Me Auto Enthusiast, Truck Enthusiast

Verified Buyer

Pros

  • Durable
  • Easy To Use
  • High-Performance

Cons

    Best Uses

    • Large Cars
    • Small Cars
    • Trucks

    Comments about K&N Replacement Air Filter:

    quick easy way to boost engine

    • Was this a gift?:
    • No

    Comment on this reviewHelp Icon(earn points)

     
    1.0

    Leaks oil in the engine. Stay away!

    By 

    from Bucks County, PA

    About Me Auto Enthusiast

    Pros

      Cons

      • Flimsy

      Best Uses

        Comments about K&N Replacement Air Filter:

        The K&N filter was fine for a few months, but then the car started stalling and finally the check engine light came on. It turned out the air filters were leaking oil and screwing with the intake sensors. Ditched them for OEM and never had any issues again. Not worth it!

        • Was this a gift?:
        • No

        Comment on this reviewHelp Icon(earn points)

        (4 of 7 customers found this review helpful)

         
        5.0

        K&N never fails

        By 

        from CT

        About Me Auto Enthusiast

        Verified Buyer
        Helpful Reviewer

        Pros

        • Always Fit Perfectly
        • Durable
        • Easy To Use
        • High-Performance

        Cons

          Best Uses

            Comments about K&N Replacement Air Filter:

            I buy K&N air filters for all my cars/trucks and have never been disappointed. Yeah, they might be a little expensive but you never have to buy another one and you save about 10-20 air filters from the landfill

            • Was this a gift?:
            • No

            Comment on this reviewHelp Icon(earn points)

            (5 of 12 customers found this review helpful)

             
            5.0

            Highly recommended by car enthusiasts

            By 

            from Abingdon, MD

            About Me Casual Driver

            Verified Buyer
            Helpful Reviewer

            Pros

            • Durable
            • Easy To Use
            • High-Performance
            • Lightweight
            • Versatile

            Cons

            • Cost

            Best Uses

            • Large Cars
            • Small Cars
            • Trucks

            Comments about K&N Replacement Air Filter:

            I have heard only good things about this filter. While it is expensive, I hope to recover the cost through the product's longevity.

            • Was this a gift?:
            • No

            Comment on this reviewHelp Icon(earn points)

            (6 of 13 customers found this review helpful)

             
            5.0

            Great product

            By 

            from Boca Raton,Florida

            About Me Auto Enthusiast

            Verified Buyer
            Helpful Reviewer

            Pros

            • High-Performance

            Cons

              Best Uses

                Comments about K&N Replacement Air Filter:

                Defenitly great improvement,perfect fit

                • Was this a gift?:
                • No

                Comment on this reviewHelp Icon(earn points)

                (7 of 11 customers found this review helpful)

                 
                5.0

                Another high quality K&N filter.

                By 

                from Williamsburg, VA

                About Me Auto Enthusiast

                Verified Buyer
                Helpful Reviewer

                Pros

                • Durable
                • Easy To Use
                • High-Performance
                • Lightweight
                • Versatile

                Cons

                  Best Uses

                  • Large Cars
                  • Small Cars
                  • Trucks

                  Comments about K&N Replacement Air Filter:

                  2008 Infiniti G37S.

                  • Was this a gift?:
                  • No

                  Comment on this reviewHelp Icon(earn points)

                  (9 of 14 customers found this review helpful)

                   
                  4.0

                  As expected

                  By 

                  from Massachusetts

                  Verified Buyer
                  Helpful Reviewer

                  Pros

                  • As advertised
                  • Durable
                  • Easy To Use
                  • High-Performance

                  Cons

                  • None

                  Best Uses

                    Comments about K&N Replacement Air Filter:

                    Easy- straight "drop in" fit.
                    Wife's car, made her do it - still married!!!

                    Comment on this reviewHelp Icon(earn points)

                    (8 of 15 customers found this review helpful)

                     
                    5.0

                    Great Product!!

                    By 

                    from NJ

                    Verified Buyer
                    Helpful Reviewer

                    Pros

                    • Durable
                    • Easy To Use
                    • High-Performance

                    Cons

                      Best Uses

                      • Large Cars
                      • Small Cars
                      • Trucks

                      Comments about K&N Replacement Air Filter:

                      Improved air intake. Too early to measure MPG difference.

                      • Car & Truck:
                      • Auto Enthusiast

                      Comment on this reviewHelp Icon(earn points)

                      (8 of 15 customers found this review helpful)

                       
                      5.0

                      fit like a glove (Not OJ's)

                      By 

                      from Los Angeles

                      Verified Buyer
                      Helpful Reviewer

                      Pros

                      • Durable
                      • Easy To Use
                      • High-Performance

                      Cons

                      • None so far

                      Best Uses

                      • All makes

                      Comments about K&N Replacement Air Filter:

                      No need to replace just clean every 30-50K. Product fit into air filter container with no problems.

                      • Car & Truck:
                      • Casual Driver

                      Comment on this reviewHelp Icon(earn points)

                      (5 of 12 customers found this review helpful)

                       
                      5.0

                      Last filter I will ever buy for this car

                      Profile Image

                      By 

                      from Westfield ,ma

                      Ask me a question

                      Verified Buyer
                      Level 3

                      Pros

                      • Durable

                      Cons

                        Best Uses

                        • Large Cars
                        • Small Cars
                        • Trucks

                        Comments about K&N Replacement Air Filter:

                        K&N put out a great product and the 1,000,000 mile replacement means I will never need to buy another filter for this car again. Just a quick cleaning every 50,000 and good to go.

                        • Car & Truck:
                        • Auto Enthusiast, Mechanic

                        Comment on this reviewHelp Icon(earn points)

                        Displaying reviews 1-10

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                        Do you have questions about this product?(earn points for answers!)

                         

                        Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

                        3 Questions | 3 Answers
                        Displaying questions 1-3
                        • Q:

                          Hi..do I need to buy oil or the spray for this filter? Can I clear filter with water once needs to clear ?
                          Asked on 8/1/2014 by Nate

                          1 answer

                          • CUSTOMER CARE

                            A:

                            I'd be happy to help you with that! You would need the cleaning kit in order to properly clean and oil it. The filters come pre-oiled when purchased new. You have to apply the filter cleaner first, then you wash out the dirt with water. The cleaner is Part Nnumber 99-0621 and the oil is Part Number 99-0516. When you pull up the product page for either of those parts, there is an instructional video on the page which will show you the cleaning process.

                            Answered on 8/4/2014 by Anonymous
                        • Q:

                          Will this air filter increase HP to my 2009 Infiniti G37S
                          Asked on 1/29/2012 by RROUI!#

                          1 answer

                          • CUSTOMER CARE

                            A:

                            Yes, this K&N Panel Type Cotton Gauze Air Filter with part# 33-2399 fits your 2009 Infiniti G37 Sport and K&N recommends these air filters as that are designed to increase horsepower and acceleration while providing excellent filtration.

                            Answered on 1/30/2012 by Vincent from AAP
                        • Q:

                          does this engine filter come with 2 or 1
                          Asked on 9/30/2011 by Anonymous

                          1 answer

                          • CUSTOMER CARE

                            A:

                            It is sold individually.

                            Answered on 9/30/2011 by Dennis from AAP
                        Displaying questions 1-3

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