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Help identify mid length headers 99 ls1 formy

This is a discussion on Help identify mid length headers 99 ls1 formy within the External Engine forums, part of the LSx Technical Help Section category; Bought this formy and dont know what headers it has , they are not long tubes they are mid length ...

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    Help identify mid length headers 99 ls1 formy

    Bought this formy and dont know what headers it has , they are not long tubes they are mid length . What brands make mids. The only one i can think of is mac . Also i dont see any markings on them so how to identify .

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    Senior Member INMY01TA's Avatar
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    Mac and Bassani.

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    would the jba count as well? either way take them off and get some lt's. I vote for kooks

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    Yeah I was kinda dissaponted to see mid lengths. But they otta be better than manifolds.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Ramairetransam View Post
    Yeah I was kinda dissaponted to see mid lengths. But they otta be better than manifolds.
    If they are "Mac" brand, those actually preform very well. Nothing to be disappointed about
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
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    Quote Originally Posted by nhraformula View Post
    If they are "Mac" brand, those actually preform very well. Nothing to be disappointed about
    Agreed, I had them on my first ls1 car and they worked verry well. Id just keep em on there.

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    Im just wonder if anyone has some identifying way to tell what they are.

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    Quote Originally Posted by Ramairetransam View Post
    Im just wonder if anyone has some identifying way to tell what they are.
    Post up a pic and I can tell ya quickly. Seems like mine had some kind of tag on the drivers side header tube?????

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    Does the collector have a ball and socket type flange?? If so then there macs.

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    i don't know 100 percent but i think they were 3 bolt flange not ball and socket . but the car is still up in the air ill grab some pics.

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    Quote Originally Posted by Ramairetransam View Post
    i don't know 100 percent but i think they were 3 bolt flange not ball and socket . but the car is still up in the air ill grab some pics.
    Do that, I will check back in a bit.

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    None Shall Pass Knight's Avatar
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    Three bolt flange could be Hooker.

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    I just looked at the mac headers and they look like those , so either i have them and don't remember the ball flange or they are hooker . I will do some research and we will find out what these junkers are.

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    I think they are macs, someone said they are decent right ?


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    Those are Macs. I had them on my car for years. They work great.

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    How much hp am i giving up having them on there over lt's?

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Ramairetransam View Post
    How much hp am i giving up having them on there over lt's?
    at the very most 10rwhp.

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    So realistically i should just leave them . I want to do egr and air delete and smooth bellows and ls6 intake for now .

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    member since may 2000 nhraformula's Avatar
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    Leave them on. Smooth bellows is a waste of time and $$, dont bother.

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    Quote Originally Posted by nhraformula View Post
    Leave them on. Smooth bellows is a waste of time and $$, dont bother.
    Au Contraire! I swapped out the stock bellows for a smooth bellows and gained .05 seconds and .75 MPH. Not much but every second/MPH counts at the track.

    FWIW: If you don't race your car then, yes, it's a waste of $$$...

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