Qty:1

Other Sellers on Amazon
Add to Cart
$45.01
+ Free Shipping
Sold by: LogicAutoParts
Add to Cart
$38.95
+ $8.50 shipping
Sold by: Orange Coast Infiniti
Add to Cart
$47.91
+ Free Shipping
Sold by: Discount Auto Warehouse
Have one to sell? Sell on Amazon

Image Unavailable

Image not available for
Color:
  • K&N 33-2031-2 High Performance Replacement Air Filter
  • Sorry, this item is not available in
  • Image not available
  • To view this video download Flash Player
      

K&N 33-2031-2 High Performance Replacement Air Filter

by K&N
| 10 answered questions

List Price: $74.10
Price: $47.99 & FREE Shipping. Details
You Save: $26.11 (35%)
In Stock.
Ships from and sold by Amazon.com.
  • 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
See more product details
71 new from $38.95

Winter Performance Parts Sale in Automotive

Frequently Bought Together

K&N 33-2031-2 High Performance Replacement Air Filter + K&N 99-5000 Aerosol Recharger Filter Care Service Kit
Price for both: $60.08

Buy the selected items together



Product Information

Technical Details
BrandK&N
Item Weight1 pounds
Product Dimensions13.5 x 7.8 x 1.8 inches
Item model number33-2031-2
Manufacturer Part Number33-2031-2
OEM Part Number BBWQ33-2031-2
  
Additional Information
ASINB000182DPG
Best Sellers Rank #5,423 in Automotive (See top 100)
Shipping Weight1 pounds (View shipping rates and policies)
ShippingThis item is also available for shipping to select countries outside the U.S.
Date First AvailableNovember 10, 2004
  
Warranty & Support
Warranty, Parts: Parts
Feedback
 Would you like to give feedback on images?
 

Product Description

Product Description

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 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.

Amazon.com

K&N Engineering Inc.

K&N Replacement Automotive Air Filters

The K&N High-Flow air filter is designed to achieve high, virtually unrestricted air flow while maintaining filtration levels critical to ensure long engine life. Our automotive OE (original equipment) replacement air filters generally add 1-4 horsepower. The secret to our success lies in the unique characteristics of our filter medium that was originally developed by K&N all those years ago in the dust, sweat and tears of desert motocross racing. We just wanted to win races and stumbled on a cotton filtration technology destined to be great. Our high flow cotton gauze air filter is washable, reusable and built to last for the life of an automotive or motorcycle engine. K&N air filters consist of four to six sheets of cotton gauze layered between two sheets of aluminum wire mesh. This media is then pleated and oiled to enhance its filtering capabilities and overall performance. K&N Air Filters were created for an environment requiring maximum horsepower and enhanced acceleration in addition to protection from the dirt and dust of off-road racing. The result is an air filter that allows dramatically more air into an engine, is washable and reusable, and will protect your engine for the life of your vehicle.

Designed to Increase Horsepower & Acceleration

K&N High-Flow Air Filter Features & Benefits
  • Will NOT Void Vehicle Warranty
  • Emissions Legal in all 50 US States
  • Economical, a K&N Air Filter Will Last the Life of Your Automobile, Motorcycle, or ATV
  • Easy to Install
Dyno Chart example
Dyno Chart example - 33-2360 with est. gain of 2.15 horsepower at 5695RPM on a 2009 Toyota Corolla 1.8L
view larger
.
Airflow Comparison Chart
Results will vary depending on part number and vehicle.
view larger
.

Engine Protection and Filtration

Anyone can flow more air. The trick is to flow more air safely. In our opinion we hit the sweet spot – an optimal blend of high air flow, filtration efficiency, durability and dust capacity. We take filtration seriously. K&N Air Filter media has been tested both in-house and by independent labs using the ISO5011 test developed by the Society of Automotive Engineers. In addition we test many of our filters both in and out of the OE airbox ensuring proper fit and function. Our goal is to design filters with the maximum possible airflow achievable while providing guaranteed engine protection.

The Importance of Oil

A K&N Air Filter is made of 4 to 6 layers of cotton gauze sandwiched between two epoxy-coated aluminum wire screens. The cotton is treated with a specially formulated grade of oil causing tackiness throughout the cotton’s microscopic strands. The nature of the cotton allows high volumes of airflow, and when combined with the tackiness of the oil creates a powerful filtering media that ensures engine protection. In contrast, most other media can not maintain the same balance of airflow and filtration throughout the filter's life without sacrificing one or the other. With a K&N Air Filter, there is no sacrifice.



Never Replace Your Air Filter Again

Handmade in the USA and in the United Kingdom using only the finest materials, K&N OE Replacement Air Filters are washable and reusable. Regardless of what you’ve heard, it’s almost impossible to wash your K&N Air Filter too much. Inside our testing laboratory, we have washed and re-oiled one K&N Air Filter more than 100 times and it still performs up to specification. Depending on your driving conditions, we recommend cleaning your air filter every 50,000 miles.

About K&N Engineering

K&N Engineering, of Riverside, California, is the inventor and leading innovator of reusable cotton gauze filter technology for automotive applications. From humble beginnings as a family run business over 35 years ago, K&N Engineering, now a truly global company with offices in the UK and the Netherlands, continues to exist as a family owned business with an enthusiast mindset and a direct connection with motor sports that carries over throughout all levels of management and manufacturing.

Customer Reviews

Feels like the engine really breathes better and helps it run a little smoother.
John R. Barnes
Don't mind paying a little more for quality and am hoping never to replace air filter in this car again so worth the money.
bingyjay
I installed this in my 240 SX and DID notice a slight performance increase with no noticeable loss of gas mileage.
Mookie

Most Helpful Customer Reviews

20 of 20 people found the following review helpful By Colkem on April 18, 2010
Make no mistake, K & N filters are top notch, but beware of people who claim huge improvements in mileage and power (i.e. 10-15%). With the billions of dollars the auto industry has spent trying to improve gas mileage and power, every car made in the world would have these as original equipment if such gains were possible. If life were only so simple. People who replace a CLOGGED filter with a new one will notice an improvement (if it's clogged badly enough, the improvement might be that your car runs now). Definitely better than many in fit and quality, plus being reusable, but a magic bullet it is not. A clogged K & N filter will also cause performance problems, it's just that all you have to do is clean it properly, and you are off and running; whereas a paper filter, you have to throw it out.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
13 of 14 people found the following review helpful By whitetrashdevil on May 23, 2007
Verified Purchase
After replacing my stock air filter with the K & N I did notice better acceleration through the gears, along with slightly increased gas mileage. Also, I think the price compares to about 2-3 regular air filters, so it pays for itself anyway after only a few years. Add this to the mileage you gain and it's a rockin' good deal!
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
9 of 11 people found the following review helpful By WMWM on August 11, 2010
Verified Purchase
First, this filter will NOT give you huge horsepower gains, it might give you minimal MPG gains just by replacing the filter from a dirty, clogged one, but that will come with any filter. I bought this filter because it does save money, money you would be spending buying paper filters over and over again, with this and a 10-15 dollar service kit, this filter will last your vehicles lifetime. There is a trade off though, this filter does not screen out dirt as well as say a "paper" or foam type filter, that is why "off roading" voids the damage warranty. however i never off road, and for highway and street use, this filter is King in terms of economy and durability (it is made of 4-5 layers of cotton encased with a aluminum wire mesh surrounded by hand poured urethane), they mean it when they say it will last a Million miles. This filter earns my recommendation.
3 Comments Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
4 of 4 people found the following review helpful By Joel on July 11, 2013
Verified Purchase
This product as advertised came delivered in good condition, when installed worked as expected. The vehicle a 2001 nissan maxima breathes alot better and works pretty great. This is a definite buy.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
6 of 7 people found the following review helpful By WX Guy on January 5, 2009
I have to admit that I was a skeptic. However, the price for the K&N was close to the inflated dealer OEM price. I have noticed increased HP and better fuel efficiency on my Toyota Sequoia. It is hard to quantify but I liked the results enough to buy another filter for our other vehicle. Shipping was very fast and product was well packaged. I would definitely purchase again... and I did.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
11 of 14 people found the following review helpful By dwayneh71 on March 25, 2008
Verified Purchase
I have noticed a little more power in the mid to high power range. Although I haven't seen an increase in gas mileage. It's to soon to judge the overall reliability and performance, but I am satisfied so far!
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
10 of 13 people found the following review helpful By Jay on March 16, 2007
Verified Purchase
As always, K&N didn't let me down. On their website they showed a 5% gain in HP on the high end, but because of my family's history with K&N I bought the filter anyway. I did notice a bit more pickup in my X-Terra, but the real benefit is the increased power on demand. The lag I was used to between hitting the gas and feeling the acceleration have dropped considerably. A great advantage when you have to maneuver quick!
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again
5 of 6 people found the following review helpful By Notman on January 6, 2008
Verified Purchase
Replaced standard air filter in a 2004 Nissan Frontier Crew Cab V6 5-Speed - Consistently get 20 MPG (High end for rated Mfg MPG) for combo city/hwy driving, and I do not drive conservatively. I do not have previous data, as I just bought truck (Used). Great throttle response. K&N have a superior reputation. Amazon saved me approx. $15.00 over local auto stores.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback. If this review is inappropriate, please let us know.
Sorry, we failed to record your vote. Please try again