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Replacement Filters > Replacement Air Filter

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33-2078
 
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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®


Product Specifications 
Air Filter Shape:Panel
Filter Material:Cotton Gauze
Filter Re-Oiling Amount:1.19 oz (35 ml)
Height:1.063 in (27 mm)
Inner Wire:No
Outside Length:12.75 in (324 mm)
Outside Width:5.75 in (146 mm)
Package Contents:1 Air Filter
Package Quantity:1
Part Number:33-2078
Product Box Height:13.56 in (345 mm)
Product Box Length:7.72 in (196 mm)
Product Box Width:1.75 in (44 mm)
Product Style:Panel Air Filter
Top Style:Open
Weight:1.3 lb (0.6 kg)


Customer Feedback      Be the first to review part 33-2078

I've been using K&N air and oil filters for many years now, cars and motorcycles. The last car I had was a BMW 525i and I consistently calculated a 3-4 mpg (highway) improvement in gas mileage. I recently purchased a 2012 Infiniti M37 and am averaging 2-3 mpg improvement on the highway. I just like the fact I don't have to change the paper filters often and do notice better gas mileage on the highway which makes me feel a little better since I have to use premium grade. When I checked all the auto parts stores they didn't have them or told me they were on backorder. I called K&N directly and they were shipped out quick. Customer service was above average and worked efficiently. And if you ever decide to engineer and sell automobile CABIN FILTERS that have carbon/charcoal layer and are oiled with a light scent, SIGN ME UP! I hate changing the air filters so often. There is a model of the Infiniti that has a feature called Forest Air that people seem to love. Unfortunately, mine doesn't have it. Just sayin. Thanks.
Bo Lawrence, Austin, Texas
Update on my July 15, 2003 submission to K & N on my results

To Whom IT May Concern,
I must say that I am very impressed with your product. When I installed part number 33-2277 on my 2003 Honda Accord EX V6, I initially tested its performance on a closed track. Well after some additional testing recently, something interesting was discovered. On a certified Dyno machine, the stock wheel horse power and torque increased from 204.5 hp and 180.7 ft/lbs to 216.3 hp and 191.4 ft/lbs! The flywheel horse power rating at 240 hp is likely 250 hp using the standard calculations. What was most interesting is how the power curve changed. The engine developed a flatter torque curve with a peak at 4,750 rpm as opposed to the 5,000 rpm stock reading. The same results followed with the horse power delivery. I don't believe hype, so the math results tell the story. After using this product for 90 days, I re-tested the performance results at the same track, and here is what happened:

0-60 7.0 seconds stock

0-60 6.87 seconds K & N installed July 2003

0-60 6.63 seconds K & N after 90 days


1/4 mile 15.5 seconds @ 92 mph stock

1/4 mile 15.1 seconds @ 94.2 mph K & N installed July 2003

1/4 mile 14.8 seconds @ 97.8 mph K & N after 90 days


Top Speed (certified with a calibrated and properly operated radar gun)

138 mph stock

143 mph K & N installed July 2003

146 mph K & N after 90 days


Gas Mileage (measured with the on-board Honda Navigation and mileage calculators)

25.0 mpg city, 31.0 mpg highway stock

26.0 mpg city, 33.5 mpg highway K & N installed July 2003

26.4 mpg city, 33.7 mpg highway K & N after 90 days

Note: When the testing was being completed, the gas mileage for that day was 17.2 mpg. Obviously, this type of driving was not usual and customary, and thus was not included in the overall gas mileage calculations.

Additional testing was conducted and across the board increases in performance in 5-60, 20-40, 30-50, and 0-100 mph tests were very apparent. I have discussed my findings with some Honda experts and they say that part of the results should be credited to the on board computers for the car. They say that engine computers have likely remapped the fuel/air mixtures to take advantage of the new levels of air available in the intake as a result of the use of your product. This makes sense to me. My neighbor installed a K & N filter in his BMW M5 and ZO6 Corvette and saw similar performance increases. I hope that anyone who reads this testimonial understands that these results are facts, that should be easily repeatable with other vehicles.
David, Chappaqua, New York
The air filter was a perfect fit on my wife 2011 BMW 328i.
Ryan Wen, California