Kooks Header install, would you...
Thread Starter
Safety Car
Joined: Jan 2005
Posts: 4,500
Likes: 1,449
From: Pittsburgh PA
2025 C8 Stingray of the Year Finalist - Unmodified
2024 C8 of the Year Finalist - Unmodified
Kooks Header install, would you...
have Kooks headers installed using the stock cats with no x-pipe??
Chevy dealer can install them using the existing cats and no x-pipe and claims no tune needed and no codes will be thrown. Price is $1,500 for headers shipped and installed.
The alternative is to use hi flow aftermarket cats, x-pipe (more $$) but also the tech. claims I would then need to get a tune to keep codes from being thrown which would cause it to fail PA OBDII emissions testing.
Any advice is appreciated.
Chevy dealer can install them using the existing cats and no x-pipe and claims no tune needed and no codes will be thrown. Price is $1,500 for headers shipped and installed.
The alternative is to use hi flow aftermarket cats, x-pipe (more $$) but also the tech. claims I would then need to get a tune to keep codes from being thrown which would cause it to fail PA OBDII emissions testing.
Any advice is appreciated.
Team Owner
Joined: Feb 2001
Posts: 27,246
Likes: 128
From: Short Hills, NJ
Sounds like a good idea but part of the gains from doing long tubes comes from using high flow (or none at all) cats in place of the more restrictive stock ones.
I would think using the above method would help (and might help in the event of an emissions spot inspection) but one is still leaving some potential gains on the table as well.
I would think using the above method would help (and might help in the event of an emissions spot inspection) but one is still leaving some potential gains on the table as well.
Melting Slicks
Joined: Sep 2004
Posts: 3,287
Likes: 1
From: Union City CA
Sounds like a good idea but part of the gains from doing long tubes comes from using high flow (or none at all) cats in place of the more restrictive stock ones.
I would think using the above method would help (and might help in the event of an emissions spot inspection) but one is still leaving some potential gains on the table as well.
I would think using the above method would help (and might help in the event of an emissions spot inspection) but one is still leaving some potential gains on the table as well.
Drifting
Joined: Nov 2002
Posts: 1,651
Likes: 125
From: laguna niguel ca
News flash!!!
It's a federal violation to move the cats from there location in which they were certified. Your dealer is full of crap. I don't think he wants to be hit with a large federal fine for tampering with the cats.
andreas g.
andreas g.
Safety Car
Joined: Jul 2006
Posts: 4,647
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From: Objects in your mirror are losing , Long Island, NY
St. Jude Donor '08
I installed the kooks LT, x-pipe and hi flo cats, B&B route 66 cat backs.. No codes appeared. Then I installed the Vortex ram air. Still no codes appeared. Finally prior to installing 4.10 gears,. Chuck cow performed a lap top tune and showed me the parameters, and he clearly showed me via his lap top, that I was on the verge certain codes appearing.
So just because the codes don't appear, it doesn't mean that all is fine and dandy with the motor, nor does it mean that it is running efficiently. If you install headers only, don't worry about codes. At any rate I would do full exhaust and tune, if I was you, and if headers only, I would still do a tune.
So just because the codes don't appear, it doesn't mean that all is fine and dandy with the motor, nor does it mean that it is running efficiently. If you install headers only, don't worry about codes. At any rate I would do full exhaust and tune, if I was you, and if headers only, I would still do a tune.
Team Owner
Joined: Feb 2001
Posts: 27,246
Likes: 128
From: Short Hills, NJ
True, even in keeping OEM cats but simply moving them is technically illegal, moving stock cats is likely no more legal than installing high flow cats in a position other than stock. In fact, I would bet that installing aftermarket high flow cats in the stock cat location (not possible with long tubes of course) would more legal than having the factory/OEM cats in a 'non stock' location LOL.
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Race Director
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From: Westport, MA. www.tbyrnemotorsports.com - 1-877-4-TBYRNE
St. Jude Donor '06-'07
(always wanted to use that 
)You also shouldn't have any codes after installing this package. The complete package is the way to go.
Tom
Team Owner
Joined: Mar 2006
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From: God Bless America
Except, If they are damaged or you have cause to believe they are faulty. Hmmm, damaged?
Le Mans Master
Joined: Feb 2006
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From: Chandler Arizona
Team Owner
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Pro
Joined: Aug 2006
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From: Dayton Ohio
My Kooks LTs w/ HF cats and xpipe should be here tomorrow!
Team Owner
Joined: Feb 2001
Posts: 27,246
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From: Short Hills, NJ
I have yet to hear of anyone getting in trouble for having aftermarket cats on their vehicle though, be they in the stock location or otherwise.
Drifting
Joined: Feb 2007
Posts: 1,446
Likes: 0
From: Cranford NJ
have Kooks headers installed using the stock cats with no x-pipe??
Chevy dealer can install them using the existing cats and no x-pipe and claims no tune needed and no codes will be thrown. Price is $1,500 for headers shipped and installed.
The alternative is to use hi flow aftermarket cats, x-pipe (more $$) but also the tech. claims I would then need to get a tune to keep codes from being thrown which would cause it to fail PA OBDII emissions testing.
Any advice is appreciated.
Chevy dealer can install them using the existing cats and no x-pipe and claims no tune needed and no codes will be thrown. Price is $1,500 for headers shipped and installed.
The alternative is to use hi flow aftermarket cats, x-pipe (more $$) but also the tech. claims I would then need to get a tune to keep codes from being thrown which would cause it to fail PA OBDII emissions testing.
Any advice is appreciated.Max
908.317.4496
Team Owner
Joined: Mar 2006
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From: God Bless America
Yes but even then they'd still have to be OEM style (or actual OEM) put back in the stock location...this all based on one wanting to remain 100% legal of course.
I have yet to hear of anyone getting in trouble for having aftermarket cats on their vehicle though, be they in the stock location or otherwise.
I have yet to hear of anyone getting in trouble for having aftermarket cats on their vehicle though, be they in the stock location or otherwise.
So to your point, "I have yet to hear of anyone getting in trouble for having aftermarket cats on their vehicle though, be they in the stock location or otherwise." I completely agree.
Le Mans Master
Joined: Oct 2006
Posts: 5,474
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From: Bradenton, FL & Chandler AZ
St. Jude Donor '09
I have the kooks with x-pipe high flow cats. I was throwing codes until I found some o2 simulators and had cbrf4i1, a fellow forum member, tamper with them and modify them. Now, no codes!!!!!!!!
By the way, I cannot see how your dealer shop would be able to fit the headers and the original cats
. BUT if they are willing to install the headers with the x-pipe for you GREAT, then no chance of them giving you crap about warranty issues.
By the way, I cannot see how your dealer shop would be able to fit the headers and the original cats
. BUT if they are willing to install the headers with the x-pipe for you GREAT, then no chance of them giving you crap about warranty issues.
Former Vendor
Joined: Aug 2004
Posts: 166
Likes: 0
Sounds like a good idea but part of the gains from doing long tubes comes from using high flow (or none at all) cats in place of the more restrictive stock ones.
I would think using the above method would help (and might help in the event of an emissions spot inspection) but one is still leaving some potential gains on the table as well.
I would think using the above method would help (and might help in the event of an emissions spot inspection) but one is still leaving some potential gains on the table as well.
I agree. Chuck at Corvettes of Westchester installs LG longtubes all the time, and with the header package comes the high flow cats. It is alway's a good idea when doing headers to get a good tune. After the headers, although with a stock tune you may not throw any codes right away, your air flow tables in the pcm will be off (now your car is breathing alot better) and a good tune can add much more power than just headers alone. Plus, your car will be fully optomized and SAFE!! Just make sure you go to a good tuner (like Chuck at COW!!!!
)