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Replacement Filters > Replacement Air Filter

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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 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®
Available Information
33-2051 Cross Reference
Installation Instruction Sheet
33-2051 Vehicle Applications

Part 33-2051 Product Specifications
Product Style: Panel Air Filter
Height: 1.063 in (27 mm)
Outside Length: 13.75 in (349 mm)
Outside Width: 4.125 in (105 mm)
Air Filter Shape: Panel
Filter Material: Cotton Gauze
Package Contents: 1 Air Filter
Package Quantity: 1
Filter Re-Oiling Amount: 0.8 oz (24 ml)
Inner Wire: No
Top Style: Open
Weight: 1.1 lb (0.5 kg)
Product Box Length: 8.31 in (211 mm)
Product Box Width: 1.75 in (44 mm)
Product Box Height: 17.19 in (437 mm)

Customer Feedback      Be the first to review part 33-2051

K&N Air Filter

I drive a 1996 Buick Roadmaster with the LT-1, 5.7 litre engine and 128K miles. I was familiar with your products from seeing them installed on shows on Speed Channel.

My friend recently put an air filter in his 4.0 litre V-8 Dodge truck on recommendations from friends. He experienced both power and gas mileage increase...primary reason for his buying K&N was gas mileage increase.

On his recommendation, I put one in my car and found an immediate increase in power and smoother, quicker transitions through the gears of my transmission...requiring less pedal to effect a downshift. (Transmission new at 118K miles.)

I usually get 16.5 mpg around town and 27 mpg on the highway. (A 2:56 rear helps!) I look forward to increasing my mileage with your product, as I no doubt will. Fellow who sold me the filter says he gets more power and 2 mpg more on his old Ford Explorer. Will let you know how I make out.

UPDATE July 9, 2007
Results for '96 Roadmaster

The mileage results for '96 Roadmaster with 129K miles are exciting. For a 215 mile around town route my mileage improved from 16.5 mpg to 19.7 mpg with the A/C on about half the time.

On a 300 mile loop to NJ and back my gas mileage went from 27 mpg to 29.55 mpg. It was a 93° day and the A/C was running both ways. No attempt was made to hold the car back to 65 mph to improve the mileage. Speeds averaged between 70 and 80 mph.

Vincent H. D'Agostino, Honesdale, Pennsylvania
We just received the first K&N filter designed for my wife's 2014 Buick Encore. I put it in the car and my wife has said she already feels better throttle response with it. This is the 6th K&N filter I have used. I have installed them in all my current and past vehicles (Honda Civic, Pontiac Vibe, Scion TC, Hyundai Santa Fe, and Mazda CX-5). I find the quality top notch, and the performance better than expected.
Mike Niemczura, Cleveland, Ohio
2012 Nissan Frontier Pro 4X 4.0L. It is very loud at high rpm. It did add hp and tq from about 3500 rpm to red line. About 4500 rpm to red line it is louder than my dual exhaust. I would suggest this to anyone. I'm looking at getting one for my wife. Very good cold air intake.
Jeremiah, Bismarck, North Dakota