K&N® 33-2304 - 33 Series Air Filter

K&N Performance Air Intake Systems
K&N® - 33 Series Air FilterK&N® - 33 Series Air FilterK&N® - 33 Series Air Filter Installation InstructionsK&N® - 33 Series Air Filter Airflow TestK&N® - Cleaning GuideK&N® - Air Filter Overview 602x420K&N Authorized Dealer
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Product Details

33 Series Air Filter (33-2304) by K&N®. Get better performance, superior engine protection and more economical operation just by changing your air filter. The K&N air filter gives you increased airflow without sacrificing filtration ability. It's the last air filter you'll ever buy for your car.

K&N - F.A.Q. K&N - Air Filter Cleaning K&N - Warranty

Features:

  • Improves engine airflow
  • Increases horsepower and acceleration
  • Superior filtration without reduced airflow
  • Reduces maintenance costs
  • Washable and reusable
  • Get up to 50,000 miles between cleanings under normal driving conditions
  • Emissions legal in all States
  • Backed by K&N's Million Mile Limited Warranty

Most air filters on the market are a compromise. Many high-performance filters deliver better airflow, but sacrifice filtering ability and engine protection in the process. OEM filters, which are usually made of paper, filter adequately but at the expense of airflow. And airflow decreases as these air filters become dirty. Not so the K&N air filter. K&N air filters increase airflow without decreasing filtration ability, and the increased airflow remains consistent throughout the filter's service interval. The secret is in the K&N filter's construction.

K&N's initial goal was to develop a filter that would deliver increased airflow during dirty, dusty off-road racing conditions. Increased airflow improves the efficiency of the combustion process, increasing horsepower and torque. But just increasing airflow without ensuring adequate filtration under those conditions would result in a ruined engine. K&N's solution was a filter design consisting of 4 to 6 layers of cotton gauze sandwiched between two aluminum wire screens. The cotton is then treated with a specially formulated grade of oil that causes tackiness throughout the cotton’s microscopic strands. The resulting K&N filter not only delivers increased airflow while trapping dirt particles that could harm your engine, that level of airflow is maintained even as the filter gets dirty. The layers of oiled cotton fibers in the K&N filter trap dirt particles that are smaller than the holes in the filter media. The thickness of the layers also allows the K&N filter to trap dirt and dust on many levels, trapping more dirt without decreasing airflow. Contrast this with a paper filter that only traps dirt on its surface; as the surface area becomes clogged, the airflow rate goes down.

Each K&N air filter is custom designed to fit into your existing factory air box. The K&N filter is economical because it's the last air filter you'll have to buy for your car. It can be washed and reused many times, and since you can usually drive up to 50,000 miles between servicing, you won't have to clean it very often. And every K&N filter is backed by K&N's Million Mile Limited Warranty. By the way, check the CARiD reviews and read what the customers think of K&N porducts.

47.99
Brand: K&N       Part Number: 33-2304       UPC: 024844111562
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K&N® is the inventor and leading innovator of reusable cotton gauze filter technology for automotive applications. The first K&N filter was conceived for racing over 40 years ago and a performance enthusiast mindset continues today throughout all levels of the company. K&N is the sales and brand leader for performance filters, including an extensive line of factory replacement filters and performance air intake kits. The company actively promotes the environmental, economical and performance advantages of long-life reusable cotton gauze filters.

Product Reviews (3)

Every Customer can leave a review about our service and the product that was purchased. In order to leave your review for your new product, please follow the link in the email you receive after completing your purchase. You can rate appearance, ease of installation, price/value and product quality.

K&N® 33-2304 - 33 Series Air Filter
K&N® - 33 Series Air Filter
Average Rating:  5  4.9 of 5
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(4.8)
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K&N® 33-2304 - 33 Series 33 Series Air Filter
2015 Subaru WRX | Posted by | (Tampa, FL)

K&N came as described. Easy to install.

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K&N 33 Series Air Filter
2011 Subaru Legacy | Posted by | (Bellevue, NE)

Initially noticed an almost 2 mpg increase before the computer adjusted to the new airflow. Now, the gas mileage is back to normal, but there is a bit more power.

4 people found this review helpful.
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K&N Air Filter
2011 Subaru Outback | Posted by | (Clayton, NC)

Great value and bump in both performance and mpg. I always install these type filters in my vehicles. Helps your engine to receive proper amount of air to provide enhanced performance. They really do pay for themselves in just a couple of years of use.

4 people found this review helpful.
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Vehicle FitmentThis part is compatible with 52 vehicle(s)
Year Make Model Fitment Notes
2015 Subaru WRX    WRX / WRX STI
2014 Subaru Forester
2014 Subaru Impreza
2014 Subaru Legacy
2014 Subaru Outback
2014 Subaru Tribeca
2014 Subaru WRX    WRX STI Base / Limited; Base / Limited / Premium
2014 Subaru XV Crosstrek    Limited / Premium / Sport / Touring
2013 Subaru Forester
2013 Subaru Impreza
2013 Subaru Legacy
2013 Subaru Outback
2013 Subaru Tribeca
2013 Subaru WRX    WRX STI Base / Limited
2013 Subaru XV Crosstrek    XV / XV Crosstrek
2012 Subaru Forester
2012 Subaru Impreza
2012 Subaru Legacy
2012 Subaru Outback
2012 Subaru Tribeca
2012 Subaru WRX    WRX / WRX STI
2011 Subaru Forester
2011 Subaru Impreza
2011 Subaru Legacy
2011 Subaru Outback
2011 Subaru Tribeca
2011 Subaru WRX    WRX / WRX STI
2010 Subaru Forester
2010 Subaru Impreza
2010 Subaru Legacy
2010 Subaru Outback
2010 Subaru Tribeca
2010 Subaru WRX    WRX / WRX STI
2009 Subaru Forester
2009 Subaru Impreza
2009 Subaru Legacy
2009 Subaru Outback
2009 Subaru Tribeca
2009 Subaru WRX    WRX / WRX STI
2008 Subaru Impreza    2.5i / Outback Sport / Sport
2008 Subaru Legacy    2.5L / 3.0L
2008 Subaru Outback
2008 Subaru Tribeca
2008 Subaru WRX    WRX / WRX STI
2007 Subaru Legacy
2007 Subaru Outback
2007 Subaru Tribeca
2006 Subaru Legacy
2006 Subaru Outback
2006 Subaru Tribeca
2005 Subaru Legacy
2005 Subaru Outback
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Product Reviews (3)
Product Reviews (3)
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