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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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    • visa luotonen
      visa luotonen

      K&N filter says designed to improve acceleration and horsepower. Do they have cheaper alternatives available which would be designed only for like acceleration? Asking for a friend.

      about 10 hours ago
    • lucarvian

      so less resistance=more HP=More cr@p getting in engine?

      about 1 day ago
    • BMW E46 ///M
      BMW E46 ///M

      The cheapest way to get the most power is to remove the filter altogether, durability on the other hand is another story.

      about 1 day ago
    • Dee

      Would like to see test without any filter

      about 2 days ago
    • auxmike

      Beto O’rourk, is that you?!

      about 3 days ago
    • Charles

      As explained at about 5:50, this test ignores a critical question -- that is, how well does it filter the air? You can get better air flow by removing the air filter entirely, using a piece of window screen, poking holes in your air filter, or using an air filter that does less filtering. Result: more dirt going through your engine. But hey, you get better air flow. Congratulations.

      about 3 days ago
    • joeyhoser

      I got 10 minutes into this video before realizing I haven't checked my air filter since.... I don't even remember. Thanks.

      about 3 days ago
    • Nesmaniac

      I knew Beto could change a tire but never knew he was this mechanically inclined.

      about 3 days ago
    • Ronnie Jay
      Ronnie Jay

      How about a comparison between the K&N and a CAI?

      about 3 days ago
    • gary willis
      gary willis

      How does the oil on the K&N effect your engine?

      about 3 days ago
    • stefano ath
      stefano ath

      Now days cars the only way to increase acceleration is by a TPS module or pedal

      about 3 days ago
    • Christopher VanZetta
      Christopher VanZetta In reply to stefano ath

      And then your car is no longer valid under warranty

      about 1 day ago
    • D500 S
      D500 S

      I wonder what is the difference in a heavily turboed car... I'm pushing 2,4bar in my car, have K&M, but actually dis not expect any gains... I wonder...

      about 3 days ago
    • Douglas Kuroda
      Douglas Kuroda

      Is it worth dirtier air in your engine for no real world gain?

      about 3 days ago
    • Torobull

      Performance air filter work with a performance exhaust system combo! That is the only way to gain more horse power Out of the k&n filter!

      about 4 days ago
    • sky nguyen
      sky nguyen

      Hold the k&n up into the light and you can see lights though it, K&n is junks

      about 4 days ago
    • Roger Kremer
      Roger Kremer

      do performance exhaust great video

      about 5 days ago
    • Chris Brock
      Chris Brock

      Very Helpful! Thank you!!

      about 5 days ago
    • Steve Silvas
      Steve Silvas

      The K&N FILTER is the CLOSEST thing you can have to NO FILTER!...I've been using K&N filters for DECADES now...and even though the dyno doesn't show a HP Increase the MPG numbers are about average 2 to 3 more miles per gallon..(In my years of useage)

      about 6 days ago
    • Baller Simpson
      Baller Simpson


      about 6 days ago
    • Hermann Scheitenberber
      Hermann Scheitenberber

      You should try without filter too.

      about 6 days ago
    • Frediee Guevara
      Frediee Guevara

      Great video. I would like to learn the correlation with Miles Per Gallon

      about 7 days ago
    • Phillip Craggs
      Phillip Craggs

      I wonder how this scales in larger engines.

      about 7 days ago
    • Keith Fork
      Keith Fork

      Living on a dirt road I can attest that K&N let's dust past the filter

      about 7 days ago
    • Christopher VanZetta
      Christopher VanZetta In reply to Keith Fork

      Because it's a flawed design with bigger holes... People are stupider these days than back in the 90's all for negligible performance gains which equals less MPG

      about 1 day ago
    • Romeu Gois
      Romeu Gois

      You should try a brand its , sprint filter ,and a spark plugs L10zs brisk , okd plasma coils

      about 8 days ago
    • Pedro Garcia
      Pedro Garcia

      You should do a video on how effective each filter is at filtering out dirt & dust as I believe k&n does not do a good job which leads to more wear on the engine.

      about 8 days ago
    • John Virk
      John Virk In reply to Pedro Garcia

      This was a kind f analogy i had thought, bec if it has no filter, it can take more air, making the HP increase, more air, but doesnt really do the Job, which is to Filter the Dust, ergo it destorys the engine over wear and tear faster.

      about 4 days ago
    • Steven Bradley
      Steven Bradley


      about 8 days ago
    • wolum andreas
      wolum andreas

      Short answer: Nope. Does it take thirteen minutes?

      about 9 days ago
    • zimniy zimniy
      zimniy zimniy

      Эр фылтэр

      about 9 days ago
    • Savage

      Please, test Sprintfilter

      about 9 days ago
    • right lane bandit
      right lane bandit

      I suggest you tell your audiece how that kn filter let's a ton of dirt in your engine

      about 9 days ago