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Thread: K&N Filter

  1. #1
    Registered Member

    2018 Mazda CX-9 GT

    Join Date
    Jul 2018
    Location
    Boston, MA
    Posts
    84

    K&N Filter

    installed this filter into my intake today

    https://www.knfilters.com/air-filter...ent-air-filter


    will let you know if i see any difference. If i don't notice really anything, ill probably be swapping the whole intake out for the corksports

  2. #2
    Registered Member

    Mazda, 2016 CX-9 Signature

    Join Date
    Aug 2017
    Location
    California
    Posts
    10
    I installed the Corksport intake last week. I works great. If you go to the thread talking about exhausts. I made a couple of comments there.

  3. #3
    Registered Member

    2016 cx-9 signature

    Join Date
    Nov 2017
    Location
    San Francisco, CA
    Posts
    87
    A test done by engineering explained on youtube confirms slight gains with k&n filters. Ive had mine for about a year and it worked well.

    The difference you actually notice is not that much but i guess the main advantage is not having to buy new filters.

    The corksport intake on the other hand was quite a difference and i still havent got tired of the turbo noises.

  4. #4
    Registered Member

    Mazda CX-9 Grand Touring 2016

    Join Date
    Sep 2016
    Location
    Washington, the state
    Posts
    363
    There is always a perpetual argument whether any so-called high performance air filter, either oiled foam or oiled cotton gauze like the K&N, filters the air as well as a stock type filter. I think the truth is mixed. On some cars the K&N filters as well. On others, not so well. Doing the actual testing with mixed particle sizes is an expensive undertaking.

    If there is any performance gain of increased air flow resulting in higher horsepower, that would be at only high rpm and wide open throttle. At less than floorboarded the throttle is doing it's job of, er..., throttling the intake air. At less than high rpm the engine isn't pumping enough air to make any difference. In a turbocharged engine the turbo needs very hot, very high volume of exhaust gases to spin up to its max and pump in the max air.

    Can we all agree that there is no fuel economy gain in any modern computer controlled engine (since the '80's) with a so-called free flowing air filter? The computer controls balance the amount of fuel to match the amount of air. In a carburetted engine a clogged air filter could result in a rich mixture, but that was way back then.

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