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  1. #1
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    Oct 2010
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    Melb
    Car:
    '03 Euro [CL9]

    All About Exhaust Flex Pipes (Flex Bellows)

    Figured I pop this here so in the future people have something to reference to when trying to understand different types of flex pipes.

    What do Flex Pipes do?
    1. Reduction of the vibration generated by the engine (especially for vehicles with transverse mounted engines and turbo engines)
    2. Noise reduction
    3. Heat Isolation
    4. Prevention of hardness in exhaust systems
    5. Compensation of thermal expansion

    All flex pipes have a braid cover outside, usually with stainless steel. However, there are 3 different types of flex pipes, based on the construction of the interior.

    Non-Lined Flex Pipes
    Used mostly on older cars, as the name suggests, theres no lining inside, which can cause extra "whistling noise" (ie: worse than the whistling noise you already get from some SS headers)

    Braid Lined Flex Pipes
    As name suggests, this type of flex pipes have an internal braid to cover the inside, this allows a lower noise level and a higher heat resistance, especially on engines with turbos.

    Interlock-lined Flex Pipes
    Those flex pipes have an interlock liner made from a stainless steel expandable hose instead of braid like above. This type of Flex pipe reduces noise level even further, and can tolerate even more movement in the exhaust system.

    Hope this helps.

    EDIT:
    Source: http://www.forss.ee/public/files/Fle..._Catalogue.pdf
    Last edited by Fredoops; 05-08-2013 at 10:20 AM.
    2003 CL9 5AT *ECU REFLASHED*
    CT-E Icebox|Ralco RZ pulleys|K&N filter|DC Header|250cell Cat|Cusco Tower & H Brace| H.Drive Coilovers | Rays RE30 18x8.5 | S/S Brakelines | Rigid Collars

  2. #2
    Can you quote the source information please.

  3. #3
    Member Array
    Join Date
    Oct 2010
    Location
    Melb
    Car:
    '03 Euro [CL9]
    done.
    2003 CL9 5AT *ECU REFLASHED*
    CT-E Icebox|Ralco RZ pulleys|K&N filter|DC Header|250cell Cat|Cusco Tower & H Brace| H.Drive Coilovers | Rays RE30 18x8.5 | S/S Brakelines | Rigid Collars

  4. #4
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    Sep 2007
    Location
    Sydney
    Car:
    DC2 Squared
    Length of flex is something to consider too, usually shorter ones don't last as long in certain applications (for obvious reasons)

  5. #5
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    Sep 2005
    Location
    Somewhere In Oz
    Car:
    CD5 Accord
    Quote Originally Posted by Chr1s View Post
    Length of flex is something to consider too, usually shorter ones don't last as long in certain applications (for obvious reasons)
    And be very careful with the type of flex as the internal braided ones fail in something that has very hot exhaust gas like a turbo or E85 fueled car.
    The life of a 4 stroke engine
    It sucks it squeezes it bangs it blows

  6. #6
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    Join Date
    Feb 2013
    Car:
    HondaCivic MA9
    I've used a rather short one (~20cm overall) with interlock insides to join 4-2-1 stock d16a9 ex mani with the rest of the exhaust, exactly in the same place where stock graphite gasket is.
    ~20k km, no complains =)

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