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Diameter of Intake

This is a discussion on Diameter of Intake within the GTO forums, part of the Vehicle Specific category; The diameter of the TB intake is 78mm correct?...

  1. #1
    Member The Silver Goat's Avatar
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    Qucik Silver Metalic
    2004 GTO - M6

    Diameter of Intake

    The diameter of the TB intake is 78mm correct?

  2. #2
    Member GTO1_OHIO's Avatar
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    Phantom Black Metallic
    2004 GTO

    Quote Originally Posted by The Silver Goat View Post
    The diameter of the TB intake is 78mm correct?
    on a 04. yes.

  3. #3
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    and the outer diameter is just right to use a thick rubber band for a gasket if you are making a cold air intake tube out of 4" PVC

  4. #4
    Member GTO1_OHIO's Avatar
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    Phantom Black Metallic
    2004 GTO

    I'm not sure I'd want to attach something that rigid directly to the TB.

  5. #5
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    Quote Originally Posted by GTO1_OHIO View Post
    I'm not sure I'd want to attach something that rigid directly to the TB.
    it actually works very nice. used a hard 90, then goes into a rubber fernco fitting that gives plenty of flex before the rest of the tube. i
    used a regular hose clamp to hold everything tight

  6. #6
    Member The Silver Goat's Avatar
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    Qucik Silver Metalic
    2004 GTO - M6

    Ironic you suggest that - I replacing my K & N sleeves. I'll look in it.
    Although I've got a web site in my favrites that offers all sorts of sleeves

  7. #7
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    Torrid Red
    04 GTO m6

    is it possible to make a *somewhat* good intake with stuff from lowe's? and the 05-06 TB is 90mm correct?

  8. #8
    cutting and welding mark21742's Avatar
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    hugger orange
    2004

    Quote Originally Posted by ls1fan74 View Post
    is it possible to make a *somewhat* good intake with stuff from lowe's? and the 05-06 TB is 90mm correct?
    I did. get the thin wall 4" drain pipe, not scheduel 40.
    I used hard 90, 2 45, and a strait peice.....i cut a hole in the sheet metal uder where the old airbox sat.....fitted it all together and glued it so the new cone filter sits right behind the drivers fog light......then cut it after the 90 and put a rubber fernco fitting in to let it flex

  9. #9
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    Torrid Red
    04 GTO m6

    Quote Originally Posted by mark21742 View Post
    I did. get the thin wall 4" drain pipe, not scheduel 40.
    I used hard 90, 2 45, and a strait peice.....i cut a hole in the sheet metal uder where the old airbox sat.....fitted it all together and glued it so the new cone filter sits right behind the drivers fog light......then cut it after the 90 and put a rubber fernco fitting in to let it flex
    sweet im gonna try that. Does it sound or perform any better, or both?

  10. #10
    cutting and welding mark21742's Avatar
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    hugger orange
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    Quote Originally Posted by ls1fan74 View Post
    sweet im gonna try that. Does it sound or perform any better, or both?
    $20 in parts from home depot+ a Specter filter from the auto parts store, and it works just as good as the $200 store bought piece.
    also I'm an SD tune so I have no MAF to worry about

  11. #11
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    Torrid Red
    04 GTO m6

    I was re-reading this, and was thinking I wanna do it but also get a bigger throttle body as well. I saw Speed Inc sells an 85 and a 90 mm, are these bolt-on to a stock intake manifold?

  12. #12
    cutting and welding mark21742's Avatar
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    hugger orange
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    Quote Originally Posted by ls1fan74 View Post
    I was re-reading this, and was thinking I wanna do it but also get a bigger throttle body as well. I saw Speed Inc sells an 85 and a 90 mm, are these bolt-on to a stock intake manifold?
    I know the 90mm's are 4 bolt and won't bolt up to an ls1 or ls6 mannifold, some of the 85mm's have both the 3 hole and the 4 hole pattern, but won't really give you any performace gains because the manny is still choked down to 78mm.
    I hate to say it, but best bet is to save up for a fast

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