Thread: 99 GP GT Headers - What's best?

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  1. #1 99 GP GT Headers - What's best? 
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    Hello,
    I am looking to install some headers for my 99 GP GT, but would like to find some headers I can use on the streets, and that will pass smog? I just basically want it to be street legal.
    Any help or advice would be great

    PS-car is stock, planning to install K&N intake, + cams so if any other advice would be gr8

    Thanks
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  2. #2 Re: 99 GP GT Headers - What's best? 
    Donating Users ARFF22's Avatar
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    I've got the SLP set installed on my car and am pretty happy with it. Be aware that their flex pipe system is notorious on leaking, so you may want to replace that with a better quality one before the install. If you go with the combination Headers and Hi-Flow cat, you will probably have to upgrade or re-program your PCM so it will pass smog, not a big deal. Had my set on for a while now and have not had any problems passing N.Y. State smog. Be advised, I thought these were a real pain in the ass to install, but I'm sure any headers system for this vehicle is a pain. Don't know if anyone elsle wants to chime in.
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  3. #3 Re: 99 GP GT Headers - What's best? 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    You don't really need headers on a N/A 3.8. I would just go with a front powerlog and a 2.5" downpipe. You put too big of exhaust on your car you will lose low end torque, car will feel like a dog just cruising around. If you still wanted to get headers the SSAC off of ebay are a pretty affordable header and they have been put in a lot of cars lately with good results/ease install.
    2001 GTP PT61 Turbo, E85, Stock Motor
    2011 Chevy Cruze MT6 1.4L Turbo
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  4. #4 Re: 99 GP GT Headers - What's best? 
    club of used to own a gp 99prixgt's Avatar
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    before you decide you should ask yourself this question. How far are you going to take your build?
    16' wrx sti- stock
    06 Spice Red GTO- m6/exhaust/tune/suspension/377whp-383tq-sold
    99 silvermist gp gt-g5/xp/IC/3.0mps-parted&sold
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  5. #5 Re: 99 GP GT Headers - What's best? 
    DUI BABY Bio248's Avatar
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    Quote Originally Posted by 99prixgt View Post
    before you decide you should ask yourself this question. How far are you going to take your build?
    yyaaaayyyyy

    you dont need headers if youre staying n/a. if you want to go turbo then headers would be a waste of money. if youre planning on going blown then i see your point. what are you doing with your car?
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  6. #6 Re: 99 GP GT Headers - What's best? 
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    Quote Originally Posted by Bio248 View Post

    you dont need headers if youre staying n/a. if you want to go turbo then headers would be a waste of money. if youre planning on going blown then i see your point. what are you doing with your car?
    Y is headers a waste on turbo?
    but anyway I dont plan on adding turbo for awhile so headers, intake, cams, would be options now.
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  7. #7 Re: 99 GP GT Headers - What's best? 
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    Quote Originally Posted by 99prixgt View Post
    before you decide you should ask yourself this question. How far are you going to take your build?
    Well, I plan on adding headers, K&N intake, cams & perhaps a cartuning turbo kit.

    That seems to be about it...for now

    Turbo is definitely one of teh alst of my projects though seieng how expensive it is
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  8. #8 Re: 99 GP GT Headers - What's best? 
    GTX Level Member Toofastgs's Avatar
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    The best headers for our cars.
    The Other Guys Headers (togs)
    God i miss mine.
    00' GTP 350/420 - Retired
    98' GS - Sold
    Current - Lexus ES300
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  9. #9 Re: 99 GP GT Headers - What's best? 
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    Quote Originally Posted by Toofastgs View Post
    The best headers for our cars.
    The Other Guys Headers (togs)
    God i miss mine.

    who even sells the extreams now? I can't find them ANYWHERE!
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  10. #10 Re: 99 GP GT Headers - What's best? 
    The Blue One blueguy's Avatar
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    Headers are a no go on a stock N/A GT. Get a custom intake and save your money on that K&N junk. Money you save on making your own you can buy a Front Powerlog and catted Downpipe so your car will pass emissions.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  11. #11 Re: 99 GP GT Headers - What's best? 
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    Quote Originally Posted by bluegtp91 View Post
    Headers are a no go on a stock N/A GT. Get a custom intake and save your money on that K&N junk. Money you save on making your own you can buy a Front Powerlog and catted Downpipe so your car will pass emissions.
    I have heard something about the custom intakes on ebay being cheap knock offs since they have smaller diameters or something...but anyway, what is a front powerlog & where can I get one of those?
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  12. #12 Re: 99 GP GT Headers - What's best? 
    club of used to own a gp 99prixgt's Avatar
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    headers would be a waste of money. Most vendor turbo kits only bolt up to stock manifolds, and the stock ones are stronger, The zzp kit you need a different rear manifold. If anything id say get your intake, plog, and downpipe. You could still use the plog for turbo. As far as cams go...wait on it. Get a turbo cam when you go turbo. I don't really like cartuning kit. The Z7 kit is better imo
    16' wrx sti- stock
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  13. #13 Re: 99 GP GT Headers - What's best? 
    GTP Level Member QwikGT's Avatar
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    cam......singular
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  14. #14 Re: 99 GP GT Headers - What's best? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by mvp04nv View Post
    Well, I plan on adding headers, K&N intake, cams & perhaps a cartuning turbo kit.

    That seems to be about it...for now

    Turbo is definitely one of the last of my projects though seeing how expensive it is
    K&N = fail. Did I not already say that? Not sure where you would put the other camS...

    Quote Originally Posted by mvp04nv View Post
    I have heard something about the custom intakes on ebay being cheap knock offs since they have smaller diameters or something...but anyway, what is a front powerlog & where can I get one of those?
    Front Powerlog Manifold. Buy from ZZPerformance.

    Not EBay intakes...custom...meaning you make it yourself. There is a write-up in the how to section. Read that before you waste nearly $400 on a intake.

    Quote Originally Posted by mvp04nv View Post
    Y is headers a waste on turbo?
    but anyway I don't plan on adding turbo for awhile so headers, intake, cams, would be options now.
    CAM...as in one...you can't use headers on a turbo build because unless they are a one-off header...they don't exist.

    Quote Originally Posted by QwikGT View Post
    cam......singular
    OH...There it is LOL
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  15. #15 Re: 99 GP GT Headers - What's best? 
    GTP Level Member QwikGT's Avatar
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    i found my TOG's through a google search. i guess i got lucky. the guy jonbob on clubgp owns TOG so im sure he has sets lying around.
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  16. #16 Re: 99 GP GT Headers - What's best? 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    Dont spend $600+ on headers if you plan on going turbo down the road... Get a front stainless steel powerlog off of zzperformance.com Then save your money for turbo. I would look at the Z3 kit on zzperformance.com it is a base kit but its simple and has put out some good numbers for power so far for the cost of it. You could probably get away with getting that kit, some 1.9 rockers and piece together your own intercooler and run low 12's or high 11's. Then the tranny will probably start to give out.
    2001 GTP PT61 Turbo, E85, Stock Motor
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