Why Removing Charcoal Air Filters Is Generally A Bad Idea
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Will removing a charcoal air filter increase horsepower? Charcoal filters are designed to capture hydrocarbons that may escape out your intake when your car is shut off. They’re located after the air filter in your intake duct, and can restrict airflow. But how much effect do they really have on performance? I took two air filters, an OE filter and a performance filter, to the test, with and without the charcoal air filter. To measure the differences in horsepower and torque, each of the four filter options was put on a Mustang dynamometer, with multiple runs. A VBOX was used to measure real world acceleration differences. How much of a difference does a charcoal filter make? Check out the video to find out!

Related Videos:
Do Performance Air Filters Actually Work - automobilrevue.net/v/R1M2OW93WHBHZFk

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    • D.O.E.

      Does the sound change?

      about 2 hours ago
    • seropserop

      So on my ~450hp car I’ll get an additional 5hp? IM DOWN

      about 2 days ago
    • Boot

      Awesome, video, love the testing and numbers backing it up. The only thing I wonder from those that did remove the charcoal filter, is if removing the charcoal filter may get rid of the "bog" that I sometimes experience when going from say 0 - 45 mph. When making a right hand turn for example, and having to romp on it to quickly get up to speed before someone rams me from behind, the engine has a pretty big flat spot (most of the time) and just bogs down before picking up. I am curious from those that removed it if they noticed a more even acceleration curve?

      about 4 days ago
    • DexMaster881

      As much as I agree on some points there's also some disclaimers made probably for appealing to the law crowd.

      First not everyone drives a Subaru grandaddy. Cars that are not made to go slow will show more progress. that said you Are not going to feel it but in conjunction with a few other bolt on mods you will feel it.

      Second Lets not pretend people don't drive carburetted or SPI and MPI Enjines. Which will respond lively to better Air filter,even a clean new one.. We do not live in a prefect world where everyone has up to 7 years old car etc... And some people like driving certain vehicles regardless of their age and emissions.

      Third We both know well NOONE is going to open your Airbox and say : "Ah you don't have the mandatory Charcoal filter you don't get to pass the inspection."
      We also both know It has NO influence on Engine emissions, its designed to prevent possible emissions while the car is standing shut off. Noone measures if the car is emitting fumes while standing still. Unless you have an LPG device. But than they search for LPG leaks not Gasoline.

      As for moral choices Im not even gonna bother with a country that thinks 4 liter V8 is a daily driver. You don't get to nitpick about Ecology. It's like a Vegan butcher nah m8.
      If you are a eco nut Never do it.
      If you just want some super cheap quick and slight improvement go for it.
      If you are a tuner its a must have.
      Disclaimers in this video are like :"The following stunts are.... blah blah..." Designed to satisfy the law. You will not void anything or ruin your car and its emissions if you take it out. Go ham.

      about 8 days ago
    • Michael Price
      Michael Price

      My butt is calibrated and can detect the difference w/wo the coal filter.

      about 10 days ago
    • vulduv

      2 of my teachers thinks this thing doesn't exist, they are car mechanics aswell... :/
      (great video though)

      about 13 days ago
    • James Beckett
      James Beckett

      Should have done a run with no filters, the forbidden power gain

      about 14 days ago
    • alex.mail123

      And just with coal filter (w/o filter air)?!?

      about 15 days ago
    • Jake Palmer
      Jake Palmer

      You may not feel .0065 Gs but two tenths of a second is the difference between being next to someone accelerating from the light, and being ahead by a bumper...just saying🤷‍♂️

      about 16 days ago
    • bigdaddy741098

      Keep charcoal filter but use k&n air filter, small improvement is better than none. Plus k&n are reusable and filter the air better from what I have heard and read in the past

      about 18 days ago
    • Christopher VanZetta
      Christopher VanZetta

      Added airflow does not mean proper filtration is achieved... These third party filters are also not biodegradable, and tuned to the right specifications.

      about 18 days ago
    • Ken Lawton
      Ken Lawton


      about 22 days ago
    • Gabe Pettinicchio
      Gabe Pettinicchio

      We appreciate all you do. *Request: the performance difference between stock and then the edition of a Big 3 or Big 4 ground wire kit.*

      about 23 days ago
    • K&S Franks
      K&S Franks

      Next video should compare a CAI kit to the stock kit with the K&N filter

      about 24 days ago
    • The Moto fixery
      The Moto fixery

      I took mine off. Lick my ba!!s epa!

      about 24 days ago
    • hnl.c

      Thank you so much for this info. My car has achieved mach 1

      about 25 days ago
    • Father Jack Hackett
      Father Jack Hackett

      I wonder how many cars are running around not being emissions compliant after this video 😂
      No such problem here in the UK as long as your car passes emissions test (which isn't so strict) during the MOT you can use whatever you like on the intake

      about 29 days ago

      Dude, you have a sample size of 1 at the moment. Ever thought that the people who felt performance gains might have had a particularly clogged filter?

      about 1 month ago
    • Matthew Jenkins
      Matthew Jenkins

      It is a known trait of cotton panel replacement filters, that they flow marginally better than a new paper element, but their ability to pass air remains consistent. Paper element performance can deteriorate rapidly in just a few hundred miles.

      A really interesting test would be to put 3k miles on the K&N, then compare with the dirty paper element. That is where the K&N should really shine.

      about 1 month ago
    • George

      Get A GRIP.

      about 1 month ago
    • Bobby Dukes
      Bobby Dukes

      I just bought a Generic K&N filter and some carbon filters after watching this video. I don’t own a vehicle 🚗 tho 😂💩

      about 1 month ago
    • Coca Cola & Tacos
      Coca Cola & Tacos

      Who the hell gives this guy a thumbs down??

      about 1 month ago
    • gs custom
      gs custom

      This is proof ! Thank you

      about 1 month ago
    • Peter Hartz
      Peter Hartz

      But what about MPG?

      about 1 month ago
    • Brian Barton
      Brian Barton

      My question would be how it effects fuel mileage in every day driving.

      about 1 month ago
    • Edmund Yates
      Edmund Yates

      I understand for performance but what about fuel economy Will it give me more miles per gallon

      about 1 month ago
    • Gerard Trigo
      Gerard Trigo

      again you missed the point I am interested in, How does it effect fuel economy?

      about 1 month ago
    • Jbees games
      Jbees games

      Have done any testing with fuel efficiency in between stock and aftermarket air intake

      about 1 month ago
    • Henry Tang
      Henry Tang

      are gasoline vapors exiting though the intake harmful to the oil of aftermarket high performance filters such as K&N or BMC?

      about 1 month ago
    • Amaroq Starwind
      Amaroq Starwind

      What about testing dry versus oiled air filters?

      about 1 month ago