Replacement Air Filter
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K&N Replacement Air Filter

Part No. 33-2129 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:1.188 in
Material:Cotton Gauze
Outside Length:12.438 in
Outside Width:9.813 in
Shape:Panel

REVIEW SNAPSHOT®

by PowerReviews
K&NReplacement Air Filter
 
4.6

(based on 40 reviews)

Ratings Distribution

  • 5 Stars

     

    (32)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (2)

90%

of respondents would recommend this to a friend.

Pros

  • Easy to use (29)
  • Durable (25)
  • High-performance (23)
  • Lightweight (15)
  • Versatile (10)

Cons

No Cons

Best Uses

  • Trucks (29)
  • Large cars (17)
  • Small cars (16)
    • Car & Truck:
    • Truck enthusiast (6)
    • Reviewer Profile:
    • Truck enthusiast (15), Auto enthusiast (13), Casual driver (6), Mechanic (6), Competitive driver (3)
    • Was this a gift?:
    • No (33)

Most Liked Positive Review

 

good product

I see a lot of reviews on here about it messing with the mass air flow sensor on chevy trucks I have a 97 Silverado and a 02 avalanche and I have never had a...Read complete review

I see a lot of reviews on here about it messing with the mass air flow sensor on chevy trucks I have a 97 Silverado and a 02 avalanche and I have never had a problem with that. Not saying the people are wrong but I have never experienced this. I noticed less restriction right from the start and will eventually save time and money replacing these things. If you do encounter the mass air flow issue a simple cleaner will remove and excess oil on the sensor and maybe a soak up any extra oil with a cloth prior to installation. I love K&N filters I use the oil filters in every vehicle I have and never had a problem and same with the air filters. If your looking for HP gain you wont find it here maybe a 1/2-5 hp depending on the size and output of your engine. cleans better than most filters out there and clean air into and engine equals better combustion and cleaner engine as a whole.

VS

Most Liked Negative Review

 

Way too much oil from factory

I have used these before and all seemed well until cleaning and an oil recharge. You need to be ready to clean your MAF sensor especially if it is very close to the airbox. ...Read complete review

I have used these before and all seemed well until cleaning and an oil recharge. You need to be ready to clean your MAF sensor especially if it is very close to the airbox. I somewhat agree with K&N that the oil doesn't destroy the sensors but they can get oily which will seriously impact driveability until cleaned! There is some very high temp at which the oil will simply burn once in the engine so it doesnt seem to be a long term issue except your airbox will never reach this "burn off" temp.

Reviewed by 40 customers

Displaying reviews 1-10

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(1 of 1 customers found this review helpful)

 
5.0

pleased, and in stock

By 

from tx

Verified Buyer

Comments about K&N Replacement Air Filter:

used the online order system and a promo code applied. Seemed to work well. Found I could have picked these items up immediately, as opposed to the suggested wait time of 30 minutes from online purchase. The Brick and mortar store staff had not even gathered the items when I arrived 2 hrs after order. They just grabbed them from the store shelves and I was off (happy with my discount from promo code). Will use this again. As for K&N filters, I have reliably used these for years (several cars). Though pricier than the new competitor's filters (e.g. new synthetic vs K&N reliable cotton media), I will stick with the K&N.

  • Was this a gift?:
  • No
 
5.0

K&N air filters

By 

from Houston, Texas

Verified Buyer

Comments about K&N Replacement Air Filter:

K&N air filters are the best on the market. Use them on every vehicle I own. Easy to install, easy to clean and recharge.

  • Was this a gift?:
  • No
 
5.0

The Best!

By 

from Midland, Texas

About Me 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:

    I consider my vehicle an investment, as such I want to use the absolute best products for optimum preformance. That's why I choose K & N products.

    • Was this a gift?:
    • No
     
    5.0

    First aftermarket piece bought for truck

    By 

    from Spring, TX

    About Me Truck Enthusiast

    Verified Buyer

    Pros

    • High-Performance

    Cons

      Best Uses

      • Trucks

      Comments about K&N Replacement Air Filter:

      Doesn't get better than K&N !!!

      • Was this a gift?:
      • No
       
      5.0

      k and n filters are known for thier quality and i agree 100%

      By 

      from sonora, tx.

      About Me I Am A Doit Myself, Mechanic

      Verified Buyer

      Pros

      • No Need To Clean As Often
      • They Are Exact Fit

      Cons

        Best Uses

        • Improves All Vehicles
        • Large Cars
        • Small Cars
        • Trucks

        Comments about K&N Replacement Air Filter:

        this filters are almost maintenance free, and perform better the longer they are used, also removing and installing are usually very simple and cleaning is just as simple, with a 1,000,000 mile warranty, they pay for themselves. I really don't have nothing bad to say about this k and n filter, I have a k and n filter on all my vehicles and as soon as I get a new vehicle and a k and n filter is available I get it and install it even if the factory filter has not even been in the vehicle for it's first oil change. I definitely would recommend k and n filters to everyone.

        • Was this a gift?:
        • No
         
        5.0

        K&N filters are the best!

        By 

        from Opelika, Al

        About Me Auto Enthusiast, Truck Enthusiast

        See all my reviews

        Verified Buyer

        Pros

        • Durable
        • High-Performance

        Cons

          Best Uses

          • Large Cars
          • Small Cars
          • Trucks

          Comments about K&N Replacement Air Filter:

          Love the fact it is a lifetime filter and cleans easily. Great airflow that helps performance.

          • Was this a gift?:
          • No

          (1 of 1 customers found this review helpful)

           
          5.0

          Great product for performance vs. value

          By 

          from Colfax Wi.

          About Me Auto Enthusiast, Biker, Competitive Driver, Mechanic, Truck Enthusiast

          Verified Buyer

          Pros

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

          Cons

            Best Uses

            • Harley Davidson
            • Large Cars
            • Small Cars
            • Snowmobiles
            • Trucks

            Comments about K&N Replacement Air Filter:

            This product is way less than a cold air intake and does just as good. I have used K&N filters on all my vehicles for years and have never been disappointed. Too bad factory vehicles don't come equipped with this filter. The money saved over the long run will pay for the filter. Your engine will appreciate it.

            • Was this a gift?:
            • No

            (1 of 1 customers found this review helpful)

             
            5.0

            only filter you should buy

            By 

            from yorkville ny

            About Me Casual Driver

            Verified Buyer

            Pros

            • Durable
            • Easy To Use
            • High-Performance

            Cons

              Best Uses

              • Large Cars
              • Small Cars
              • Trucks

              Comments about K&N Replacement Air Filter:

              this should be the first and last filter you buy for your vehicle. don't waste your money on throw away filters.Cost the same as buying 2 or maybe 3 paper air filters but will last as long as i own my vehicles.i have 4 vehicles and will never have to buy an air filter again

              • Was this a gift?:
              • No
               
              5.0

              50,000 miles before cleaning is required

              By 

              from Orlando, Florida

              About Me Auto Enthusiast

              Verified Buyer

              Pros

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

              Cons

                Best Uses

                • Trucks

                Comments about K&N Replacement Air Filter:

                Fits my Silverado with 5.3L engine perfect. Looking forward to getting better fuel fiqure and more power, getting 19.2 city/highway now.

                • Was this a gift?:
                • No
                 
                5.0

                good ole K & N

                By 

                from Atlanta, GA

                See all my reviews

                Verified Buyer
                3 or more reviews submitted

                Pros

                • Durable
                • Easy To Use

                Cons

                  Best Uses

                    Comments about K&N Replacement Air Filter:

                    K&N always good

                    • Was this a gift?:
                    • No

                    Displaying reviews 1-10

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                    Do you have questions about this product?

                     

                    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.

                    8 Questions | 11 Answers
                    Displaying questions 1-8
                    • Q:

                      is the new filter ready to install or will I need to apply filter oil?
                      Asked on 9/6/2015 by ty from west monroe, la

                      1 answer

                      • CUSTOMER CARE

                        A:

                        Good question TY! This K&N Replacement Air Filter (Part No. 33-2129) is a ready to install filter. For the complete installtion instructions, please visit this link. URL - http://www.knfilters.com/instructions/17152_inst.pdf

                        Answered on 9/7/2015 by Steve from AAP
                    • Q:

                      What are the performance improvements (HP and Torque)
                      Asked on 6/19/2014 by Derek from Kennesaw, GA

                      1 answer

                      • CUSTOMER CARE

                        A:

                        Hi Derek, good question! The K&N air filter provides an estimated one to four horsepower gain. Regarding torque, please provide your vehicle's year, make, model and engine size so I can assist you further.

                        Answered on 6/20/2014 by Vincent from AAP
                    • Q:

                      Can this filter work nin an 8.1 workhorse rv?
                      Asked on 8/14/2012 by Greg from Jacksonville, Fl.

                      1 answer

                      • CUSTOMER CARE

                        A:

                        We will need more information including the year, make, model, and engine size of your application before we can make a suggestion.

                        Answered on 8/15/2012 by Aaron from AAP
                    • Q:

                      were is the filter located
                      Asked on 6/5/2011 by bud from 34604

                      1 answer

                      • CUSTOMER CARE

                        A:

                        The air filter unit is usually situated on top of the engine and it can be found slightly off centre between the front grill and the engine.

                        Answered on 6/6/2011 by Just Ask Jacob! from AAP
                    • Q:

                      Is there any truth to the accusation that this filter will cause your check engine lite to come on because of the Mass Airflow sensor detecting the oil?
                      Asked on 3/28/2011 by Mr Ed from Huntington, WV

                      1 answer

                      • A:

                        You can go on the K&N website to view the test that they have done on this matter. They also requested Failed MAFS be sent to them to determine cause of failure out of the 100's tested none were determined to be caused by the oil in the filter. They did a test in which they actually dipped a MAFS into the oil they use on the filters and the Sensor still passed. They will also fight a dealership on your behalf if the dealership tries to deny your warranty. Check it: http://www.knfilters.com/maf/massair.htm

                        Answered on 5/17/2011 by Triple D from Pittsburgh, PA
                    • Q:

                      Will this filter affect warranty
                      Asked on 1/22/2011 by Anonymous

                      2 answers

                      • CUSTOMER CARE

                        A:

                        No, it will not void the warranty.

                        Answered on 1/27/2011 by Parts Guru Geo from AAP
                      • A:

                        It is best that you contact your dealer of this situation. Cause some will say that it has to be a Motorcraft (Ford) or an AC Delco (GM). Dealerships can be very picky and use this against you.

                        Answered on 3/18/2011 by cajuncat from Springdale, Arkansas
                    • Q:

                      how do you clean this filter?
                      Asked on 5/17/2010 by Anonymous from charleston wv

                      2 answers

                      • CUSTOMER CARE

                        A:

                        You will need the recharge kit that K&N offers. This kit will have instructions on how to properly clean the filter.

                        Answered on 5/17/2010 by Mike from AAP
                      • A:

                        When you clean this filter, use ther pump spray bottle and spray it on the intake side of the air filter (side facing down into air box). Wait for 5 minutes after spraying to soak for better cleaning. Then use a small amount of water pressure from a hose and spray thru the opposite side of where you sprayed the cleaner. Make sure you spray the same path as the cleats (RIBS) for better results. Depending on the weather conditions, you can let it dry outside in the sun for about one to two hours. Or you can use a hair dryer to dry it quicker after you have shakin it to make sure all of the water is out of the cleats. After drying, spray small amount of your oil on the intake side while following the cleats. Let this dry about 30 minutes. Hold your filter up to bright light to make sure that you have an even coat of spray. If not, lightly spray that spot. If not, reinstall your filter in the breather box. On some truck models you have to reset the air fillter monitor gage.

                        Answered on 3/18/2011 by cajuncat from Springdale, Arkansas
                    • Q:

                      does this filter increase mpg
                      Asked on 12/5/2009 by Anonymous

                      2 answers

                      • CUSTOMER CARE

                        A:

                        K&N air filters have been know to improve gas mileage in some vehicles more than others.

                        Answered on 3/17/2010 by Mike from AAP
                      • A:

                        Depending on your driving conditions and what shape that your motor is in, yes, this can increase your MPG's from low as 2 to 6 or 7 at most. But , there are other things that can even help you more. Like proper maintanance, tire pressure, wheel balance and alignment and other things that are mentioned in your owners manual. You take care of your vehicle and your vehicle will take you many miles down the road.

                        Answered on 3/18/2011 by cajuncat from Springdale,Arkansas
                    Displaying questions 1-8

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