Do Performance Air Filters Actually Work? 10 Interior Fails That Make 3 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

Jonathan Smith
I don’t know if the tiny increase in horsepower is worth the extra cost and frequent maintenance required for a K&N filter. An aftermarket replacement filter for my car is around $17, while the K&N filter is $56, and requires periodic oiling and cleaning. So you also have to buy an oiling kit for it as well. Just something to consider.
K&N in every car I’ve ever owned since 1997!
Only reliable channel when it comes to cars. YouTube is full of amateurs.
William Brewer
If using a dino as a measuring too rather than a comparison isn't useful then why are dinos so widely used to measure and tune?
The car quest and k&n filters have nearly twice as many pleats, therefore almost twice as much filter material for the air to pass thru. Larger filter area, less restriction.
Bernie Fen
This is probably by far the best comparison video with OEM vs performance drop in filter.  Great review man thank you!!!
Duke Kenspocket Studio
Did you oil the K and N filter before the test?
Jeremy 77
Very well spoken video, fastest talking sob I've ever heard
Sweetpotato Johnson
You’ll be fine if you know how to take care of your K&N filter.
Gr8 M9ds
Interesting data - what is needed to fully test the K&N is how it performs after multiple cleanings. Im skeptical about the ability to clean it to ‘new’ condition. I’m guessing that an old recleaned K&N does not have any advantage.

Also, by omitting filtration tests, you could be trading a couple of HP for expensive repairs (over time) which negates any low cost performance savings.
Mike Miller
Been using them for 25 years. Every car with a KN filter always gets 1mpg more.
Kristian Spencer
Put a k&n filter in my bmw e46 and it drove like a dog, put a piper cross filter in and there was a massive difference. Just put one in my 2008 vectra Sri , restrictive to start with just until the ecu got used to if , now she runs more responsive and with a very nice sound.
More air = more dirt ! K&n filters let a lot of dirt through ..for minimum gains at high rpms.
m hall
Can you do a green filter test too ?
The Air pressure of the atmosphere pushes the air into the engine through the filter, the engine does not pull the air in. The K/N filter does not filter out small dogs or little children quite as good as the OEM filter. Also, how many cheap filters can you buy, versus the cost of the K/N filter? Probably more than you'll ever buy during the life of the car. lol
Thats nice, but how does it filter dust in the micon level and when does it block.
Clark Bigatel
was the engine at the same temperature for all dynos? could have just gotten to running temp.
2mil subs and no 4k?? Cold air intake??? What about no filter??
Dan Lomeli
Beto O'Rourke?
Eric Genereux
I like your unbiased, scientific approach. Letting the numbers speak for themselves.
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10 Interior Fails That Make Do Performance Air Filters Actually Work? 3 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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