Kooks Headers

**SSilverSS** · 03-02-2010, 05:05 PM

What is the difference in http://www.kookscustomheaders.com/show.php?pid=169 and http://www.kookscustomheaders.com/show.php?pid=170?

I obviously know the price difference but what does it mean in the second one that the tube is a 1 7/8 x 2? Im not running any mods so just wondering what would be the best header for a stock ls1, but will have some mods in the future, probably heads and cam one day. Sorry im a newbie, thanks.

**pajeff02** · 03-02-2010, 05:18 PM

I think the second set is stepped. It increases in diameter from 1-7/8" to 2". Unless you are forced induction or aftermarket big inch LS, the second set is probably overkill. FWIIW, I have the first set installed on our car.

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If you are considering a purchase -- check with KY Speed.

**marksls1ta** · 03-02-2010, 05:22 PM

the first set is what I would go with. The step is more for big cubes(408, 427)

Let me know if we can help.

thanks,
Mark

**SSilverSS** · 03-02-2010, 05:42 PM

wait. so these headers dont have o2 sensors plug ins?

**Mr. Luos** · 03-02-2010, 05:43 PM

Originally Posted by SSilverSS

wait. so these headers dont have o2 sensors plug ins?

They should.

As for the two pairs...the first is best.
Although since you don't have extensive mods, a 1.75" tube would be fine for you. And might save a few bucks.

I run the ones in the first link on my 402.

**SSilverSS** · 03-02-2010, 05:52 PM

Originally Posted by Mr. Luos

They should.

As for the two pairs...the first is best.
Although since you don't have extensive mods, a 1.75" tube would be fine for you. And might save a few bucks.

I run the ones in the first link on my 402.

On KY Speed, they say they have no emmisions fittings, what does this mean? And thanks for all the help

**marksls1ta** · 03-02-2010, 05:53 PM

they have the bungs for the sensor to be install into. they dont have the 02 extensions.

the emissions fitting are for the air systems the little "T's" on the headers.

Race headers dont have them just smooth pipes.

thanks,
Mark

**SSilverSS** · 03-02-2010, 06:05 PM

Originally Posted by marksls1ta

they have the bungs for the sensor to be install into. they dont have the 02 extensions.

the emissions fitting are for the air systems the little "T's" on the headers.

Race headers dont have them just smooth pipes.

thanks,
Mark

So would i just be better off buying a header that have the extensions and everything. like http://www.kookscustomheaders.com/show.php?pid=184

No matter what i get, im gonna order from KY Speed, great prices

**marksls1ta** · 03-02-2010, 06:16 PM

turn on your pms so i can send you my # please.

Thanks,
Mark

**SSilverSS** · 03-02-2010, 06:32 PM

Originally Posted by marksls1ta

turn on your pms so i can send you my # please.

Thanks,
Mark

how do i turn them on? Sorry, just signed up to this forum a few days ago

**marksls1ta** · 03-02-2010, 06:38 PM

i sent you an email from site with it.

Thanks,
Mark

**pajeff02** · 03-03-2010, 03:41 AM

OP: The first set actually has an extra bung on the driver side header that you can install a wide band in. Unless you need it for emissions in your state, deleting the secondary air system isn't a bad idea. Removes quite a bit of clutter from the engine bay and you can have it tuned out so that your SES is not triggered. The system simply pumps fresh air into the exhaust for a minute or two after cold startup to bring the cats up to temp sooner.

**SSilverSS** · 03-03-2010, 05:30 PM

Originally Posted by pajeff02

OP: The first set actually has an extra bung on the driver side header that you can install a wide band in. Unless you need it for emissions in your state, deleting the secondary air system isn't a bad idea. Removes quite a bit of clutter from the engine bay and you can have it tuned out so that your SES is not triggered. The system simply pumps fresh air into the exhaust for a minute or two after cold startup to bring the cats up to temp sooner.

Yeah this what im probably going to do, get the first set of headers and delete the AIR system

**pajeff02** · 03-03-2010, 06:14 PM

Here is a write up on deleting the secondary air system: http://www.ls1.com/forums/showthread.php?t=130641 Remember that you will need a tune to prevent the SES from triggering, which you should do anyway with headers as they will affect your fueling.

**SSilverSS** · 03-03-2010, 06:28 PM

Originally Posted by pajeff02

Here is a write up on deleting the secondary air system: http://www.ls1.com/forums/showthread.php?t=130641 Remember that you will need a tune to prevent the SES from triggering, which you should do anyway with headers as they will affect your fueling.

So a local dyno shop would tune that out while tuning for headers, right?

**pajeff02** · 03-03-2010, 06:29 PM

Originally Posted by SSilverSS

So a local dyno shop would tune that out while tuning for headers, right?

Should be able to. I also had our rear O2's deleted after the header install.

**SSilverSS** · 03-03-2010, 06:37 PM

and by getting lt headers, it completely eliminates where the AIR system bolts into the exhaust manifold, right? Like it wont bolt back up to the new header?

**Mr. Luos** · 03-03-2010, 06:59 PM

Originally Posted by SSilverSS

and by getting lt headers, it completely eliminates where the AIR system bolts into the exhaust manifold, right? Like it wont bolt back up to the new header?

Correct.

If you get headers without emissions fittings you got it right.

**SSilverSS** · 03-03-2010, 07:02 PM

Cool, thanks alot guys

**pajeff02** · 03-04-2010, 03:45 AM

If you think emissions will ever be an issue, you can always buy the emission style LT's but install a block off plate. This would allow you to put the system back on the car. Technically, our car has to pass a visual inspection of the emissions equipment once a year, meaning it is supposed to have the secondary air system intact.