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  1. #1
    Junior Member
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    Wisconsin
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    Pewter
    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
    01 TA & 02 CETA

    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.

  3. #3
    Member QKSLVR99's Avatar
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    Pewter
    1999 Trans Am

    second that..

  4. #4
    Tech Junkie hammertime's Avatar
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    Pewter Metallic
    2001 Camaro SS

    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
    2001 Light Pewter Metallic Camaro SS, 6 speed
    K&N, SLP Lid, SLP y-pipe, GMMG cat-back, Lou's Short Stick - more to come!

  5. #5
    Member QKSLVR99's Avatar
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    1999 Trans Am

    okay yeah but who lightly mods their car.... just kidding

  6. #6
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    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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    Black/Black
    96 Vert Z28-RIP/94 TT Z28

    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
    Junior Member
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    1999 WS6 TA

    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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