Do Performance Air Filters Actually Work? 10 Interior Fails That Make 6 months ago   13:24

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Performance air filters claim to increase horsepower and improve acceleration, but do they actually work? I took four air filters, included dirty & clean OE filters, a low cost aftermarket filter, and an expensive performance filter and put them to the test. To measure differences in horsepower and torque, each filter was put on a Mustang dynamometer, with multiple runs. A VBOX was used to measure real world acceleration differences.

The idea behind performance air filters is that a less restrictive air filter means the engine doesn’t have to work as hard to bring in air. That means it’s more efficient, and makes more power. It could also mean the engine pulls in more air, and with more air, the engine can inject more fuel to make more power.

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Comments 3651 Comments

Thomas Burns
Air filters are not for performance. They are to clean the air that goes into the car.
U should have tested with out a filter
john goodfellow
we need a oil bath
Daryl Villaescusa
The dumbest test. You said it yourself. If you want performance, you less restrict it. If you want to catch smallest and more dirt, you want finer filter mesh. It's up to you how long you keeping your car
I'd say it's not worth throwing away a good, clean airfilter for a K&N one. Kind of like throwing away perfectly good lightbulbs to replace them with expensive LEDs. But if you're going to change it anyways... might as well invest a few more dollars and get a better airfilter. I changed the airfilter on my 2007 Ford Fiesta 1.3 60 horsepower car and did notice an improvement. Granted, the old filter wasn't that great anymore, but the car sounds a bit more powerful and I did notice slightly better acceleration and top speeds.
When comparing air fiters, the points to compare are pressure drop accross media on a curve, what material the media is made of, how small particulate matter filter can catch and what is the total weight of contaminates the filter media can catch and hold before media fails or no longer flows enough air to feed machine. How filter performs when saturated with water....then your more fancy dyno test.
Leenesh G
Please do a video of NO AIR FILTER vs stock air filter! next
Paul Power
35 yrs using KN filters I love them. Take your time & Clean them as recommended.
SlpprEatrr 03
You should do this test with a new edge mustang gt, a v6, then a 4cylinder
Brad Ansell
One point is does the K&N filter remove the dirt as effectively as the OEM filter? Can you test that?
Jim Cole
Well a 13.24 video and all I needed to see was fast forward to results to 6.22. Save your time
Leonard Daneman
My 5.7ltr 3valve seemed weak and using more gasoline. I checked the air filter and it didn't seem that bad, but I changed it anyway. The change was noticeable. Especially amazing, its performance change going up a locally-know steep and long grade on I-25. The old filter, the SUV empty, had to downshift out of overdrive and into two lower gears to keep up 70 mph. After the filter change I had three passengers and the SUV kept speed limit (75) up the entire hill in overdrive.
Yamen Aly
I want to know does it increase gas mileage ?
Oleg Solovey
good lob, thank you!
Tim Barnett
K&N filters are oiled. Was this filter oiled out of box or did it need oil an what performance change stats?
C Mauldin87
Does an average of $50 for K&N filters make sense for a 2 - 3% power increase?? Probably not. Rather put that $50 towards a tune or in your pocket for fuel.
Bill Carlson
Great testing and observing results...
elijah kimmel-gray
please tell me someone heard him say "er redy in the core"
Mike N.
I would have liked to have seen a more randomized test on the dyno, though the correlation to real-world testing is compelling. It could have been the gradual increase in HP was due to changing engine and dyno conditions, and not the filters themselves. At a minimum, it would have been nice to have gone back to the dirty OEM filter to see if values changed after the car and dyno were fully 'warmed up'. Products and testing equipment can change with time and based on conditions.
A. Radwan
Is it possible to test without filter ?
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10 Interior Fails That Make Do Performance Air Filters Actually Work? 6 months ago   04:11


Car companies put a lot of effort into interiors, but there are often infuriating details which can ruin the whole cabin. Here are 10 examples of interior fails!


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