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K&N 33-2451 Air Filter

Replacement Filters > Replacement Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   50 Customer Reviews
  • 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®
The K&N 33-2451 Air Filter fits some Hyundai Elantra, Hyundai Elantra Coupe, Hyundai Elantra GT, Hyundai I30, Hyundai i30 II, Hyundai i30 III, Hyundai i40, Hyundai IX25, Hyundai ix35, Hyundai Langdong, Hyundai Santa Fe II, Hyundai Tucson, Kia Carens, Kia cee d, Kia Cerato, Kia Cerato Koup, Kia Forte, Kia Forte Koup, Kia Forte5, Kia K2, Kia K3S, Kia K4, Kia KX3, and Kia Sportage models. See vehicle applications link for details.
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.

[More Information on K&N Replacement Air Filters]

Product Specifications

Air Filter ShapePanel
Filter MaterialCotton Gauze
Filter Re-Oiling Amount0.86 oz (26 ml)
Height0.875 in (22 mm)
Outside Length10.125 in (257 mm)
Outside Width6.5 in (165 mm)
Package Contents1 Air Filter
Package Quantity1
Product Box Height13.56 in (345 mm)
Product Box Length7.72 in (196 mm)
Product Box Width1.75 in (44 mm)
Product StylePanel Air Filter
Weight1 lb (0.5 kg)

K&N 33-2451 Air Filter Product Reviews

Saturday, March 18, 2017 - Part 33-2451
Excellent product, like K&N always is.

Kelly Rothermel
Plainfield, Wisconsin
Monday, November 14, 2016 - Part 33-2451
I love my new filter. It was easy to install and I have seen increased MPG, which is awesome.

Bryon Kelly
Davenport, Florida
Wednesday, November 2, 2016 - Part 33-2451
After years of reading favorable reviews about K&N air filters, I decided to splurge and buy a filter for my 2015 Hyundai Elantra. Installing the filter took less than a minute. I will be honest, I wasn't expecting any difference between my old paper filter and this one. Boy was I wrong. I noticed a difference the moment I gave my car some gas. Acceleration and throttle response have improved drastically. The engine no longer hesitates when taking off. The Elantra usually had to downshift a gear to make it up the slightest incline in the road, while really digging my foot into the gas pedal to get that downshift, no more. The car climbs hills without a hint of struggling and now downshifts as expected instead of waiting for the next full moon. This K&N filter truly is magic. Thank you K&N, you've made a customer for life!

Jeremie G.
Rouyn-Noranda, Quebec
Wednesday, November 2, 2016 - Part 33-2451
Immediately felt the performance difference in my car. Fuel MPG is better. Happy that K&N shipped out my order immediately and I was excited to install it once it arrived. Thanks K&N for the pleasant shopping experience.

El Monte, California
Saturday, September 24, 2016 - Part 33-2451
I drive 100 mile a day and was amazed at the difference in my cars performance with this air filter. My gas mileage improved along with acceleration. I never expected such a noticeable overall difference. I will be ordering another for my KIA Sportage when replacement is due. Thanks

Mark Walters
Bloomington, Illinois
Wednesday, September 14, 2016 - Part 33-2451
Awesome! Car performs better and saves you a ton of money.

Brett G. Lesser
Valparaiso, Indiana
Tuesday, August 16, 2016 - Part 33-2451
Replacing the stock air filter that had only had 30,000ish miles on it and it was not even dirty, with this K&N made a huge difference in power, fuel mileage and throttle response. This filter was more than worth the money.

Clinton, Utah