Replacement Air Filter
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K&N Replacement Air Filter

Part No. 33-2031-2 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 virtually every vehicle on the road. These filters are washable and reusable

Product Features:
  • 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:1.125 in
Material:Cotton Gauze
Outside Length:11 in
Outside Width:6.563 in
Shape:Panel

REVIEW SNAPSHOT®

by PowerReviews
K&NPanel Type Cotton Gauze Air Filter
 
4.7

(based on 18 reviews)

Ratings Distribution

  • 5 Stars

     

    (14)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (16)
  • Durable (14)
  • High-performance (12)
  • Lightweight (6)
  • Versatile (5)

Cons

No Cons

Best Uses

  • Trucks (6)
  • Large cars (4)
  • Small cars (4)
    • Car & Truck:
    • Auto enthusiast (5), Casual driver (3)
    • Reviewer Profile:
    • Auto enthusiast (6), Casual driver (5)
    • Was this a gift?:
    • No (11)

Most Liked Positive Review

 

K&N Makes An Excellent Product!

My gas mileage went up on the very first tank after the install. Throttle responce was noticably chrisper. The fact that the filter is washable and reusable is huge.

My gas mileage went up on the very first tank after the install. Throttle responce was noticably chrisper. The fact that the filter is washable and reusable is huge.

VS

Most Liked Negative Review

 

We'll see...

Couldn't be easier to install, but after 2 weeks I haven't noticed much difference in overall performance.

I hope it helps the engine "breathe" better, but...Read complete review

Couldn't be easier to install, but after 2 weeks I haven't noticed much difference in overall performance.

I hope it helps the engine "breathe" better, but we'll see if it helps at all. I also track MPG constantly and I'll see if there is any change.

Reviewed by 18 customers

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Displaying reviews 1-10

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(2 of 4 customers found this review helpful)

 
5.0

Fits perfectly well in my 2009 Maxima SV

By 

from Hyattsville, MD

About Me Auto Enthusiast, Casual Driver

Level 2

Pros

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

Cons

    Best Uses

      Comments about K&N Panel Type Cotton Gauze Air Filter:

      I have a 2009 maxima with the sport package. I bought this air filter after having a terrible experience with another filter that didn't fit properly even though every website claimed it would! I exchanged it for the K&N(Part No. 33-2031-2) which fit perfectly with no issues! Instantly after installing this filter my car sound a hundred times better when accelerating, it felt like a brand new car again!

      • Was this a gift?:
      • No

      Comment on this review(earn points)

      (4 of 6 customers found this review helpful)

       
      4.0

      Great Product so far!

      By 

      from Lexington, NE

      About Me Auto Enthusiast, Retired mechanic, Truck Enthusiast

      Verified Buyer
      Level 3

      Pros

      • Durable
      • Easy To Use

      Cons

        Best Uses

        • Large Cars
        • Small Cars
        • Trucks

        Comments about K&N Panel Type Cotton Gauze Air Filter:

        Simple to install in my Maxima. Looking forward to performance and inceased MPG that most users see! Also nice to know I will never have to buy anothe air filter for this car. The higher cost is worth it if you figure that you probably put in $75 to $200 worth of air filters over the life of your car depending on how long you keep it. Only thing that might be better is a K&N cold air intake (CAI) and filter! Also incudes a decal that keep service people from pulling it and trying to sell you a new one! Great!

        Would have give 5 stars but really haven't drive car much since installation.

        • Was this a gift?:
        • No

        Comment on this review(earn points)

        (6 of 8 customers found this review helpful)

         
        5.0

        Perfect fit

        By 

        from Lilburn, GA

        About Me Auto Enthusiast, Truck Enthusiast

        Verified Buyer
        Level 2

        Pros

        • Easy To Use
        • Perfect Fit

        Cons

        • None

        Best Uses

          Comments about K&N Panel Type Cotton Gauze Air Filter:

          I'm a fan of K&N products and have a full intake system on my truck which I love. This purchase was for my daughter's Xterra she had recently purchased. I had found an AEM at an online retailer for a good price and when I tried to install it the filter just wouldn't fit. It was too big and the box wouldn't latch closed. Very frustrating. The K&N product installed perfectly and the job was done in less than 5 minutes. Since I already have a recharge/cleaning kit for my truck I'm all set with the Xterra when the time comes to service the filter.

          • Was this a gift?:
          • No

          Comment on this review(earn points)

          (2 of 6 customers found this review helpful)

           
          4.0

          Would buy again

          By 

          from Nyc, ny

          About Me Auto Enthusiast

          Verified Buyer
          Level 1

          Pros

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

          Cons

            Best Uses

            • Large Cars
            • Small Cars
            • Trucks

            Comments about K&N Panel Type Cotton Gauze Air Filter:

            Whats great picked up a few horsepower.

            • Was this a gift?:
            • No

            Comment on this review(earn points)

            (2 of 6 customers found this review helpful)

             
            5.0

            Works as described, more power and mpgs

            By 

            from Washington, DC

            About Me Auto Enthusiast, Casual Driver, Mechanic

            Ask me a question

            Level 5

            Pros

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

            Cons

            • Takes A While To Dry

            Best Uses

            • 03 Nissan Maxima

            Comments about K&N Panel Type Cotton Gauze Air Filter:

            I've owned my k&n air filter for over 8 years. Perfect fit for my 2003 Nissan Maxima. After the original air filter needed to be changed, decided to get this reusable, washable, increased performance filter. It was well worth the money.

            Noticeable acceleration increase on pick up and highway speeds. Sound of the engine is more aggressive, not so much as an after market air kit, but still impressive for a replacement pop in filter. Also received around 1.5 mpg more than factory filter. Still works great after multiple cleanings. Recommend a fan on low speed to increase drying time for cleanings.

            Recently purchased 2 filters for my sisters. Recent rebates and online coupons made it hard not to. Also they asked for a recommendation on a brand to buy, both were looking for a new air filter.

            • Was this a gift?:
            • No

            Comment on this review(earn points)

            (1 of 5 customers found this review helpful)

             
            5.0

            Reliable & Durable!

            By 

            from Alpharetta, GA

            About Me Auto Enthusiast, Casual Driver, Competitive Driver

            Verified Buyer
            Level 3

            Pros

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

            Cons

              Best Uses

              • All

              Comments about K&N Panel Type Cotton Gauze Air Filter:

              After 163,000 on a daily driver 2000 Infiniti G20 I finally decided to stop wasting money on disposable filters. The filter dropped in with no issues. Car runs great. Cost for the next filter change is zero!

              I used a coupon code found on the Advance Auto Parts page of http://www.sphinxracing.com/Advance_Auto_Parts.html to make a good value even better!

              • Was this a gift?:
              • No

              Comment on this review(earn points)

              (3 of 6 customers found this review helpful)

               
              4.0

              Replaced Air filter on Infiniti G35

              By 

              from St. Louis

              About Me Casual Driver

              Verified Buyer
              Helpful Reviewer

              Pros

              • Durable
              • Easy To Use
              • High-Performance

              Cons

              • Price

              Best Uses

              • Cars

              Comments about K&N Panel Type Cotton Gauze Air Filter:

              The air filter appears to be of high quality and was easy to install (but this likely depends on the make and model of your car). The first day I drove my car after replacing the air filter, I got the impression the car was more responsive on acceleration. However, I do not know for certain whether or not the car's performance increased, I suspect that it didn't or just increased slightly. It is too early to evaluate the air filter's impact on gas economy, how the filter performs over time, or how effective cleaning it will be when the time comes.

              • Was this a gift?:
              • No

              Comment on this review(earn points)

              (3 of 5 customers found this review helpful)

               
              5.0

              Easy install and maintenance

              By 

              from Springfield, VA

              About Me Casual Driver

              Ask me a question

              Verified Buyer
              Level 2

              Pros

              • Easy to install
              • Easy To Use
              • High-Performance

              Cons

                Best Uses

                • Large Cars
                • Small Cars
                • Trucks

                Comments about K&N Panel Type Cotton Gauze Air Filter:

                You can't really go wrong with K&G products. The warrenty of one millions miles is kind of hard to compete with. Overall it was an easy install and if you buy the filter kit, maintaining air filter is overall very simple. I don't see or feel the added horsepower, but with a warrently and quality of K&G, you can't go wrong.

                • Was this a gift?:
                • No

                Comment on this review(earn points)

                (4 of 6 customers found this review helpful)

                 
                5.0

                K&N Air Filter 1998 Nissan Sentra SE

                By 

                from Pensacola, FL

                Verified Buyer
                Helpful Reviewer

                Pros

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

                Cons

                  Best Uses

                    Comments about K&N Panel Type Cotton Gauze Air Filter:

                    The filter definitley gave the vehicle added performance and improved gas mileage. I am estimating from what I have seen so far I will get a 2 mpg increase.

                    • Car & Truck:
                    • Casual Driver
                    • Was this a gift?:
                    • No

                    Comment on this review(earn points)

                    (3 of 6 customers found this review helpful)

                     
                    5.0

                    Good Buy

                    By 

                    from Alabama

                    Verified Buyer
                    Helpful Reviewer

                    Pros

                    • Durable

                    Cons

                      Best Uses

                        Comments about K&N Panel Type Cotton Gauze Air Filter:

                        The product is great for increasing air flow to your engine.

                        • Was this a gift?:
                        • No

                        Comment on this review(earn points)

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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. Or contact Customer Care by email or call 1-877-238-2623.

                        4 Questions | 6 Answers
                        Displaying questions 1-4
                        • Q:

                          what is the recommened way to clean this filter
                          Asked on 12/9/2011 by g from keystone, fl.

                          1 answer

                          • CUSTOMER CARE

                            A:

                            A K&N Filter needs to be serviced every 50,000 miles. More frequent service may be necessary under extreme conditions such as off-road use where dusty conditions are prominent. Tap the air filter gently against a hard surface to dislodge loose dirt. Always tap a filter on its base or side and never tape a filter's edges because this may damage the element. Follow this up by gently brushing the filter with a soft bristle brush. An old toothbrush will work well for this. Use a genuine Filter Cleaner in either spray-on or liquid form. If a spray is used, be sure to coat the entire element and allow it to soak for 10 minutes. Use the liquid form by filling a pan to a level where the filter element is submerged beneath the cleaner. Rinse the element with low-pressure water such as from a household faucet. Do not use high-pressure spray as this will damage the element.Shake excess water from the filter and allow it to air dry at room temperature. Carefully hanging the filter in the outside air works well. A K&N Filter will not function properly without sufficient oil and will require more frequent re-oiling of the filter's clean side in between cleanings.

                            Answered on 12/9/2011 by John the Car-Doc from AAP
                        • Q:

                          K&N I want to know GOOD work air filter save gas?
                          Asked on 8/17/2010 by Angel from Great Mills,Md

                          2 answers

                          • CUSTOMER CARE

                            A:

                            K&N air filters are known for providing better gas mileage on most vehicles.

                            Answered on 8/17/2010 by Mike from AAP
                          • VERIFIED BUYER

                            A:

                            Hey Angel,
                            I have K&N Air Filters in my 1993 Nissan Maxima, My 1990 GMC Jimmy, and my 1987 Yamaha Venture Royale and I was able to notice an improvment in power and gas mileage after installing them. The real deal here is the fact that they can be washed and reused over and over again.
                            skydoc_17

                            Answered on 9/20/2010 by skydoc_17 from Duncansville, Pa.
                        • Q:

                          How much horsepower does this filter actually add to my 2010 Nissan Altima 3.5 SR ?
                          Asked on 6/13/2010 by Anonymous from Wilmington, NC

                          2 answers

                          • CUSTOMER CARE

                            A:

                            With this air filter, you won't really have a horsepower increase that is noticeable. May a 3-5 horsepower gain at most.

                            Answered on 6/14/2010 by Mike from AAP
                          • A:

                            Also, if you were thinking of gaining horsepower, you should get a cold air intake. But only allow for a 1-4% increase in power and provides better airflow.

                            Answered on 4/17/2013 by Anthony from East Stroudsburg, PA
                        • Q:

                          How do you clean these filters?
                          Asked on 5/9/2010 by Anonymous

                          1 answer

                          • CUSTOMER CARE

                            A:

                            I recommend using Part No. 99-5050 for cleaning the K&N Air Filters -
                            K&N Air Filter Oil is the only oil specially formulated to work in combination with the cotton fabric in K&N Filtercharger® elements providing a superior air filtration system. When used as directed, it quickly penetrates the filter pleats, where it remains suspended in the cotton fabric. Saturation is maintained until the element is cleaned with K&N Air Filter Cleaner.

                            Answered on 5/11/2010 by Rose from AAP
                        Displaying questions 1-4

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