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intake manifold ??

This is a discussion on intake manifold ?? within the External Engine forums, part of the LSx Technical Help Section category; I am looking at buying a new intake manifold and throttle body for my WS6. The two sizes I have ...

  1. #1
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    1999 WS6 TA

    intake manifold ??

    I am looking at buying a new intake manifold and throttle body for my WS6. The two sizes I have to choose from are 78mm and 90mm made by F.A.S.T. I was just wondering what the best choice would be?

  2. #2
    slammed RAWPWR3's Avatar
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    M.R.M. & C.E. Yellow
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    Im no expert, but if your motor is stock, i personally think the 90mm TB would be overkill, but since yours is '99 and you dont have the ls6 intake, the fast intake manifold and 78mm TB would be a nice upgrade.

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    Member QKSLVR99's Avatar
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    second that..

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    Tech Junkie hammertime's Avatar
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    Pewter Metallic
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    Do you have any other supporting mods?

    Depending on what other mods you have, this probably isn't much of a restriction yet. If you have bigger plans down the road, it maybe best to wait for the 90mm later.

    If your plan is to only lightly mod, then 78mm should be plenty.
    Hammer - hammertime.us
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  5. #5
    Member QKSLVR99's Avatar
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    okay yeah but who lightly mods their car.... just kidding

  6. #6
    Senior Member SeVeReDiStOrTiOn's Avatar
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    Port the stock Tb and get a ls6 manifold...but if you have money growing on trees then get the lsx

  7. #7
    LT1KING GOODZ/BADZ's Avatar
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    Yeah I would'nt spend the money for the 90mm unless you plan on getting the heads and cam for it to feed.

  8. #8
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    I'm getting a intercooled procharger in April and next year will proabably look into cams and heads, so I guess the 90mm is a good idea

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