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Thread: MFI high butterfly "split air horns" ?

  1. #1
    Senior Member
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    MFI high butterfly "split air horns" ?

    Hi,
    I searched and found few options for air filters on MFI high butterfly. I'm wondering if someone know a source for these split air horns ?

    Or you have a set and you can help me with some measurements ?

    Thanks and Best Regards
    JD
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    1970S Coupe, Blood orange #1436
    1965 Coupe, Dolphin gray #1506

    R Gruppe #647 ; S Registry #1666

  2. #2
    Member #226 R Gruppe Life Member #147
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    Those were sold here in the late 80 by Race Force. The tin uppers cracked and broke in pieces from vibration. Intermediate pieces were short, too short for my needs, so I made longer pieces and later got carbon upper bells. They have low mass so don’t crack.
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  3. #3
    Race Force! Remember it well. Another neat Porsche store in Emeryville...now long gone.
    Peter Kane

    '72 911S Targa
    Message Board Co-Moderator - Early 911S Registry #100

  4. #4
    Member
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    saarlouis germany
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    Hello
    There is a nice period correct solution available from germany : https://www.mittelmotor.de/racing/de/

    These guys offer a perfect copy of the airfilter box used in the porsche rally car 911SC/RS
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  5. #5
    Senior Member 2.5MFI's Avatar
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    Made my own version. Not period correct but works great.Name:  IMG_0889.jpg
Views: 410
Size:  126.0 KB
    Mark Jung
    MFI Werks
    Early 911S Registry #972
    Carrera T w/LWB, MT, RWS, PCCB
    72 T 66 x 100 MFI Twin Plug Coupe
    R Gruppe #686

  6. #6
    Senior Member mar2mar's Avatar
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    Mark, Your air intake opening looks huge. I bet the induction sounds amazing. what air filter are you using? Thanks Marlon

  7. #7
    Senior Member NZVW's Avatar
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    Big

    is

    better

    well

    that's

    MFI MARK

    4

    ya.

    (just keeping social dis tan cing)
    Mark

  8. #8
    Now THAT is funny!!
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  9. #9

    ITG and high butterfly air filtration

    Tech 9 makes an ITG filter system that attaches to the stock high butterfly air horns. I saw these on their website a long time ago, lost the link, and then saw them on one of Gib's (letsrollbabe) cars. I reached out to Gib and he gave me the contact for Phil at Tech 9 who hooked me up with a set last year. Pm me if you'd like me to forward Phil's contact to you. The first picture below isn't from Tech 9 but it looks like their air filter.

    Name:  Tuthill-porsche-911-engine-1.jpg
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Size:  91.0 KB

    Name:  Tech 9 High Butterfly filter.jpg
Views: 256
Size:  62.0 KB
    Last edited by Tonger; 09-15-2020 at 06:41 AM.

  10. #10
    Senior Member
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    I can also vouch for these on my HBs.

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