Pontiac Grand Prix Forums : Grandprix

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

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.

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.

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2001 GTP PT61 Turbo, IC, #65 Inj. E85

before you decide you should ask yourself this question. How far are you going to take your build?

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99 GT- L36:GenV:N*:1.9 rollers:Pacesetters:slp catback:3ep trans:Intense Input shaft:stock pulley
BPC member

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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98 XGT - sold
06 impreza 2.5i 5 speed - stock, slow, and awesome

The best headers for our cars.
The Other Guys Headers (togs)
God i miss mine.

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We can’t help ourselves. We see a line, we want to cross it. Maybe it’s the thrill for trading the familiar for the unfamliliar. A personal dare. The only problem is once you’ve crossed it’s almost impossible to go back. But if you do manage to make it back across that line you find safety in numbers.

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.

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2003 Blue-Black Metallic GTP Sedan - Almost Done...
2007 Gold Mist Chevrolet Cobalt LT - Custom CAI, NGK V-Power's, Muffler Delete, Custom Tuned PCM...Sure does have every bit of 130 FWHP
http://www.cardomain.com/id/03blueGTP

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

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?

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.

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

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99 GT- L36:GenV:N*:1.9 rollers:Pacesetters:slp catback:3ep trans:Intense Input shaft:stock pulley
BPC member

cam......singular

K&N = fail. Did I not already say that? Not sure where you would put the other camS...

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.

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.

OH...There it is LOL

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2003 Blue-Black Metallic GTP Sedan - Almost Done...
2007 Gold Mist Chevrolet Cobalt LT - Custom CAI, NGK V-Power's, Muffler Delete, Custom Tuned PCM...Sure does have every bit of 130 FWHP
http://www.cardomain.com/id/03blueGTP

who even sells the extreams now? I can't find them ANYWHERE!

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.

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.

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2001 GTP PT61 Turbo, IC, #65 Inj. E85