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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 06-18-2013, 11:33 PM   #1
craig0214
 
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Factory cats with headers

Go ahead and tell me that this topic has been talked about before... Im Sure it has. But here it goes anyway.
I have ordered a set of kooks longtube headers. I was hoping to bolt them right up , do some burnouts and drive away. Now I have ran into a question. Do I have to go buy high flow cats?? Or can I use my factory cats?? I understand that high flow cats will give me more power... But .. I just dropped a lot of cash for these headers and really don't want to drop another 500-600 for high flow cats. I'm thinking that if i do use my factory cats , it probably will not void any warranty either. I know that if I cut out my cats completely , I will get the maximum power but will defiantly lose warranty . I have only 20k miles on the car... Really don't want to void any warranty just quite yet.
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Old 06-18-2013, 11:42 PM   #2
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your stock cats will not bolt up to any long tube header. If you buy shorties (short headers) then they will bolt up to factory cats, but you wont get as much power as going long tubes. With long tubes you have 2 choices. Buy the HFC made for the specific long tubes your are buying or go catless.
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Old 06-18-2013, 11:47 PM   #3
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Spend the money now and get the HFC's. If you're going with LT's then get a tune as well.
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Old 06-18-2013, 11:59 PM   #4
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That's not what I wanted to hear...lol. I have already ordered the long tube headers, I"m defiantly not going shorty headers. I just don't have the extra 500-600 for the high flow cats.... Looks like it's back the savings account we go. And I think I'm right about voiding warranty with the complete removal of the cats. I read that the car sounds good without cats... But I really don't want the odor in the car either.
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Old 06-19-2013, 12:07 AM   #5
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Quote:
Originally Posted by craig0214 View Post
That's not what I wanted to hear...lol. I have already ordered the long tube headers, I"m defiantly not going shorty headers. I just don't have the extra 500-600 for the high flow cats.... Looks like it's back the savings account we go. And I think I'm right about voiding warranty with the complete removal of the cats. I read that the car sounds good without cats... But I really don't want the odor in the car either.
It isn't worth the future emissions headache either. Adding headers and removing cats won't void your warranty, but the tune most likely will.

Some more info here: Best Long Tube Headers for the Money
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Old 06-19-2013, 12:08 AM   #6
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Tuning voids the warranty remove cats does not.
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Old 06-19-2013, 12:29 AM   #7
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LT's without a tune is a waste. I compare it to Lebron James in The Finals these last 2 weeks...something is holding that man back.
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Old 06-19-2013, 12:38 AM   #8
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Is the order really that bad?
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Old 06-19-2013, 12:40 AM   #9
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If it is not too late order the headers and cats as a package if you can it should be cheaper than $600 that way.
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Old 06-19-2013, 05:14 AM   #10
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your stock cats will not bolt up to any long tube header.
This. It just isn't an option.
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Old 06-19-2013, 07:18 AM   #11
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Is the order really that bad?
That's like asking which exhaust system sounds best. Some people like the smell; some don't. All I can say with certainty is that the smell is always there. Whether you can smell it and/or like it is completely up to your nose.
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Old 06-19-2013, 07:26 AM   #12
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Quote:
Originally Posted by craig0214 View Post
That's not what I wanted to hear...lol. I have already ordered the long tube headers, I"m defiantly not going shorty headers. I just don't have the extra 500-600 for the high flow cats.... Looks like it's back the savings account we go. And I think I'm right about voiding warranty with the complete removal of the cats. I read that the car sounds good without cats... But I really don't want the odor in the car either.
Bite the bullet and get the HFCs and a tune. You will be glad you did.

Removing the cats does not void your warranty but it may prevent you from passing your state's emission testing (if you have one). This is not to be confused with a tune; that's a separate issue regarding warranty.

These cars sound great with LTs. No cats will just make that sound louder. Also, depending on what you have for the rest of your exhaust system, the tone can change....all very subjective and endlessly debated.
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Old 06-19-2013, 02:35 PM   #13
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As has been said. Adding headers, with or without cats, doesn't void your warranty. It's the tune that may or may not do that. That would depend on how cooperative your local GM dealer is. Your headers should be coming with offroad pipes so that's what i'd do for now. The smell isn't too bad once you get it tuned. Keep an eye out for Kooks cats in the members for sale section. They come available from time to time for around $250-300.
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Old 06-20-2013, 12:23 AM   #14
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Great advise. I will slap those longtubes on and leave the cats off. Will I throw any codes? Nothing more embarrassing than riding around with a check engine light on.. And as far as emissions, I live in Arkansas. That's the last thing I have to worry about. And If I get tuned, I'm thinking about a plug in, like a diablo , and with that I can always go back to factory settings.
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Old 06-20-2013, 12:25 AM   #15
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LT's without a tune is a waste. I compare it to Lebron James in The Finals these last 2 weeks...something is holding that man back.
the sound isnt worth it ?
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Old 06-20-2013, 12:44 AM   #16
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Originally Posted by craig0214 View Post
Great advise. I will slap those longtubes on and leave the cats off. Will I throw any codes? Nothing more embarrassing than riding around with a check engine light on.. And as far as emissions, I live in Arkansas. That's the last thing I have to worry about. And If I get tuned, I'm thinking about a plug in, like a diablo , and with that I can always go back to factory settings.
Headers without a tune will give a CEL. No way around that except for kooks green cats.

And resetting back to factory will still show that your car was tuned, even if they can't see what you did. So keep that in mind.
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Old 06-20-2013, 01:24 AM   #17
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Originally Posted by craig0214 View Post
Great advise. I will slap those longtubes on and leave the cats off. Will I throw any codes? Nothing more embarrassing than riding around with a check engine light on.. And as far as emissions, I live in Arkansas. That's the last thing I have to worry about. And If I get tuned, I'm thinking about a plug in, like a diablo , and with that I can always go back to factory settings.
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Headers without a tune will give a CEL. No way around that except for kooks green cats.

And resetting back to factory will still show that your car was tuned, even if they can't see what you did. So keep that in mind.
This

NONE of the off the shelf programmers have the ability to turn off the rear O2 sensors. Those are the ones that will throw the CEL. If you have a online tuner that uses the diablo, he can turn them off in a mail order tune.
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Old 06-20-2013, 08:42 AM   #18
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Originally Posted by craig0214 View Post
Go ahead and tell me that this topic has been talked about before... Im Sure it has. But here it goes anyway.
I have ordered a set of kooks longtube headers. I was hoping to bolt them right up , do some burnouts and drive away. Now I have ran into a question. Do I have to go buy high flow cats?? Or can I use my factory cats?? I understand that high flow cats will give me more power... But .. I just dropped a lot of cash for these headers and really don't want to drop another 500-600 for high flow cats. I'm thinking that if i do use my factory cats , it probably will not void any warranty either. I know that if I cut out my cats completely , I will get the maximum power but will defiantly lose warranty . I have only 20k miles on the car... Really don't want to void any warranty just quite yet.
You can always cut one of the 2cats off out of the remaining 4 that come with the car.
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Old 06-20-2013, 08:50 AM   #19
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You can always cut one of the 2cats off out of the remaining 4 that come with the car.
^^^clueless and a bad idea!

That's a hack job!
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Old 06-20-2013, 09:08 AM   #20
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the guy asked a question...I suppose if you really wanted to, you could cut the cats off your OEM mid-pipes and then welded them into the catless off road pipes that usually come with a set of headers..only benefit would be the lack of smell VS a catless setup.
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Old 06-20-2013, 09:10 AM   #21
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You can always cut one of the 2cats off out of the remaining 4 that come with the car.
not with LTs... all 4 cats have to be removed.

Quote:
Originally Posted by craig0214 View Post
Great advise. I will slap those longtubes on and leave the cats off. Will I throw any codes? Nothing more embarrassing than riding around with a check engine light on.. And as far as emissions, I live in Arkansas. That's the last thing I have to worry about. And If I get tuned, I'm thinking about a plug in, like a diablo , and with that I can always go back to factory settings.
go catless. do not worry about the CEL until you can get some $ for HF cats and a tune.

It is possible that it will take several weeks before you throw a code... and you can always clear the code with a handheld or at autozone. I drove around for a month with LTs (and HF cats) and never threw a code.
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Old 06-20-2013, 09:37 AM   #22
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This pic might help you understand. The top one is the stock header with the stock cats mounted to it. The bottom is a LT header with a HF cat. You can see that the OEM mid-pipe will no way bolt up.

Now, that being said, you an buy some connection pipes that don't have Cats. You just need to check to make sure cats aren't required in your area for inspection.
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Old 06-20-2013, 09:49 AM   #23
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As already stated our headers will not bolt up to your factory cats. I would recommend going with our new Green Cats for the most power and still maintaining warranty and emissions. Our Green cats can be installed with no tune and no CEL. You will pick up power with headers and no tuning, but to get the most from your combo we recommend a tune.
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Old 06-20-2013, 10:15 AM   #24
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seems to me like the OP was asking if there was a way to use the oem cats with headers?? Sure..Cut/weld..would you want to ?
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Old 06-20-2013, 06:54 PM   #25
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Thanks so much for all the responses guys. I have learned alot. To answer the last question..Do I want to cut and weld to my brand new Headers..hell no. I should have looked into a package deal with the longtubes and HF cats together. I looked at the Kooks Green high flow cats... and as much as i would like to just pull a couple bucks out from under my couch seat and buy some, I was looking for a cheaper route. lol.

Thanks for the pics caveman. I see the huge difference in the set up. Like I said before , I live in arkansas...there are no inspections/emissions testing here....no at all. Most people around here drive tractors. so, no worries there.

After all the reading and listening to you guys talk..and some of you sound like you know whats going on..I'm going to wait until I purchase some HF cats before I put these headers on. I said before that I was going to just go catless and deal with it...but is seems like the best thing to do. I dont want to have to go right back up to the shop when I'm able to purchase the cats and have all that redone. I have a little OCD and I cant have that check engine light on..it would drive me crazy. I will wait until I find some HF cats and have everything put on then.
Thanks again guys
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