SKU: 40231938220

K&N Air Filter (33-2331)

Sale price$49.67 Regular price$55.19
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Ships within 48 hours · Estimated delivery Sep 11 - Sep 16

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Description

K&N Air Filter (33-2331)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

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.

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

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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 40231938220

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4.8 ★★★★★
Based on 19 reviews
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Verified Purchase
NiNi
Battle Creek, US
★★★★★ 5
My favorite desk item
Color: Wood
I love my coffee but it must be hot-every sip! I'd get up at work so often to go reheat my coffee in the nuker & don'tlike the microwave AND a hater coworker even commented to me that she noticed "how much I get up from my desk" so I thought, they gotta be making coffee hot plates for desktops these days & boom, they do!! I like the wood finish, right my aesthetic alley. The plate has 3 settings; high, medium & low. Even has an auto shutoff after..idk how many hours so built in safety. I've even put my ceramic cup of soup on there to keep it warm while I work through lunch a couple times & it worked for my soup on the high setting. Coffee goes to medium when I first get in since it cools on the car ride over & then down to low once it's hot again. Will be getting one for the home office here soon.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
K
Verified Purchase
Katy
Natrona Heights, US
★★★★★ 5
Mug warmer
Color: Wood
This is a well made mug warmer, heats up quickly and convenient to use. The heat ratio is high making it easy to select the level of heat one wants to have to enjoy their coffee, tea, hot chocolate, etc. The only default I have with this product is how to turn on the warmer. It's convenient but if something is sitting next to the warmer, the warmer turns on too easily. I would recommend the manufacturer use some type of switch to turn on, adjust and turn off the warmer due to the chances of heating something up that was not intentional!
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Reviewed in the United States on April 26, 2026
M
Verified Purchase
Mercedes
Alexandria, US
★★★★★ 5
Simple and very useful
Color: White
Right out of the box it works just as expected, gets perfectly hot. Even with a small cup, my coffee typically cooks to quickly for my taste. Jumping up to give it a pop in the microwave gets old fast. Problem solved. For already hot coffee, the low is enough to keep it sippable. I'm pretty sure I could hear a can of soup from room temp on the high setting. I do hope it is doable because this is a perfect hot plate.
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Reviewed in the United States on April 22, 2026
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Verified Purchase
CatCat
Charlottesville, US
★★★★★ 4
Works great but design flaw.
Color: Wood
Works great. 3 settings. The first is HOT. I usually use the middle or low setting and they keep my cup warm and drinkable. There is a flaw though with this device. The warming button is so easy to touch /come on that several times on my desk, it has come on without me realizing it from paper hitting it, a pen rolled against it or simply moving it over and it is on highest setting when it comes on so I have burned my fingers now twice. I just always double and triple check it isn’t on.
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Reviewed in the United States on February 14, 2026
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Verified Purchase
PikeG2
Lexington, US
★★★★★ 5
Powerful Mug Warmer with Excellent Heat Output and Large Heating Surface
Color: Wood, Color: Wood
CAUTION: Unplug when not using. It is very easy to activate or turn on by mistake. Simply brushing up next to it will turn it on. Nonetheless, I use this SWEETFULL coffee mug warmer every morning and afternoon. It’s usually one of the first things I turn on so I can preheat my latte cup before pulling espresso. I like my lattes very hot, and preheating the cup helps prevent heat loss during extraction. I also use it as a candle warmer as an alternative to open flame, which I prefer for indoor air quality. The heat output is impressive. Even on the lowest setting, it gets very hot and reaches usable temperature quickly. The large heating surface is a major advantage. My latte and cappuccino cups have a wide mouth, and this warmer heats the entire base evenly rather than just the center, which makes a noticeable difference in temperature retention. Warm-up time is reasonable, though slightly faster heating would make it even better, especially during busy mornings when I’m trying to get out the door. That said, it’s not slow enough to be a real drawback, and once it’s hot, it performs consistently. Overall, this is a strong performer that does exactly what it’s designed to do. It’s a great option for coffee lovers who want hotter drinks for longer, and for candle users who prefer a flame-free, cleaner alternative inside the home.
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Reviewed in the United States on February 22, 2026

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