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K&N 33-2431 4.9 out of 5 stars 14 Customer Reviews
Replacement Filters > Replacement Air Filter

List Price: $84.79
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33-2431
 
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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 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.

[More Information on K&N Replacement Air Filters]
  • 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®

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Filter Re-Oiling Amount1.69 oz (50 ml)
Height1.25 in (32 mm)
Outside Length12.25 in (311 mm)
Outside Width9.625 in (244 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height1.69 in (43 mm)
Product Box Length12.5 in (318 mm)
Product Box Width10.38 in (264 mm)
Product StylePanel Air Filter
Weight1.9 lb (0.9 kg)


Product Reviews


  Noticed better fuel mileage right away. I have always used K&N and always will.
Allan Texas
  When reading the reviews as applicable to late model Mustangs, many said they observed a noticeable increase in horsepower. Additionally, a slight increase in MPG was noted. I installed this filter on my new 2014 Mustang 3.7L V6. I notice smoother acceleration, but a slight decrease in MPG. I was averaging 15.5-16.5 MPG in the city. Now, I am averaging 14.2-15.5 MPG. I don't think the acceleration improvement has lead to a heavier foot, so the airflow may have decreased. Or, as I might expect, the mass airflow sensor has not adjusted to the change in filter media.
Rick Arizona
  I used a K&N filter on my '93 Bronco (5.8l v8) and on my '03 Tahoe (4.3l v8) and it made no difference, but it's not expected to deliver the same results on every engine. However, as soon as I slapped one in my '14 Mustang (3.7l v6) the results were nothing short of dramatic. Now, what do I mean by dramatic? Relative to no difference, the effect was dramatic. Can I tell you how much more HP I now have? No. Can I quantify the improvement? No. What I can tell you is that it is very clear that the engine is able to breathe much easier now throughout the power band and especially at higher rpmsmore instant response with absolutely no hesitation above 3.5k rpm in any gear. I noticeably have more power! (except in 1st gear. I'm not faster off the line until ~4k rpm.) When the engine demands air, the K&N filter truly delivers. It is clearly obvious that the stock paper filter was significantly restricting the air flow. If you have a 3.7l v6 Mustang (or probably any v6 Mustang since 2012) you have to get this K&N air filter. The improvement is dramatic for only a $55 change! Further, if you have this Mustang, especially a 3.7l v6, I recommend you get the K&N Air Intake instead if it is legal in your state. Unfortunately it is not in mine, but I have run without using any air filter (for kicks to see how much improvement it would make) and the results were even more ridiculous.
Mike Zullo California
  Simple to install and slight MPG increase. Worthwhile upgrade on stock filter.
Steve Venice, California
  No problems so far!
Joseph Maletta Denver, Colorado
  Easy install - 5 min. and done. Thanks Ford. Ran K&N on '05 F150 for 160,000 miles - all good. Expect it will aid my Mustang. Just wish you made one for my '88 Ford Ranger SC 4x4.
Mike Peacock Richmond , Virginia
  Love the filter. It completes having a K&N filter in every vehicle I own.
Barbara Holter Colorado