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

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Old 11-03-2013, 07:28 PM   #1
John879
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Kook long tube headers question? Also loudest cat back exhaust?

Hey guys I have a question (and just to let you know I'm a serious amateur at car modding as of right now.) I have owned a 2012 camaro ss for two years now, and am looking to get the kook long tube headers for my first mod and am wondering what the options mean exactly (#6513, #6514). One says it comes with cats, and the other without. If I was to order the option that came without cats, would I have had to have done this manually myself, or will this be removing my cats for me? I'm really sorry if I sound like an idiot but like I said I'm very new to the whole modding scene and am doing my best to learn what I can while in college. Also I was wondering what you guys' opinion is on the loudest cat back exhaust out there that will still sound good. And if I was to have my cats removed, could I still have a cat back exhaust?
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Old 11-03-2013, 07:32 PM   #2
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Oh and I should mention those product numbers are from this page. http://www.phastekperformance.com/Ko...178headers.htm

The product numbers are the options that you must include with the headers themselves. One says "with cats", while the other says "without cats."
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Old 11-03-2013, 07:34 PM   #3
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I have Kooks longtubes + cats.

If you remove your stock exhaust, you are removing the exhaust manifolds and the entire exhaust up to the mid-section.
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Old 11-03-2013, 07:37 PM   #4
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I have Kooks longtubes + cats.

If you remove your stock exhaust, you are removing the exhaust manifolds and the entire exhaust up to the mid-section.
My question is if I was to order the option of having it without cats, would the installation process serve as like a cat delete, or would I have to do that seperate? And if I was to remove the cats, could I still install a new cat back exhaust?
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Old 11-03-2013, 07:40 PM   #5
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My question is if I was to order the option of having it without cats, would the installation process serve as like a cat delete, or would I have to do that seperate? And if I was to remove the cats, could I still install a new cat back exhaust?
If you don't get the hi-flow cats then you need to get the off road mid-pipes. I recommend getting the hi-flow cats. Either way a cat-back will connect up to it fine.
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Old 11-03-2013, 07:40 PM   #6
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Definitely go with cats. Especially if you're worried about emissions tests.

As far as the cat back, I'm in love with the sound of the Borla ATAK cat back. It's also probably one of the loudest I've heard.

Cat-back:


Headers+cat-back:
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Old 11-03-2013, 07:42 PM   #7
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If you don't get the hi-flow cats then you need to get the off road mid-pipes. I recommend getting the hi-flow cats. Either way a cat-back will connect up to it fine.
But could I go with no cats entirely, and would ordering this no cat header option remove the cats for me?
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Old 11-03-2013, 07:43 PM   #8
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Definitely go with cats. Especially if you're worried about emissions tests.

As far as the cat back, I'm in love with the sound of the Borla ATAK cat back. It's also probably one of the loudest I've heard.

Cat-back:


Headers+cat-back:
Wow that does sound great! What headers are those?
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Old 11-03-2013, 07:45 PM   #9
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If you get the version without cats, they should come with the midpipes. The midpipes are what replaces cats.
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Old 11-03-2013, 07:47 PM   #10
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Wow that does sound great! What headers are those?
Dynatech. But I would go with your original plan to go with Kooks. To answer your question, if you don't get cats, they come with a pipe to replace the cats. Any new catback will hook up to those. The term "Cat-Back" is just saying it replaces the exhaust from that location, back. Whereas an "Axel-Back" replaces just the part of the exhaust from the axle back.
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Old 11-03-2013, 07:49 PM   #11
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Dynatech. But I would go with your original plan to go with Kooks. To answer your question, if you don't get cats, they come with a pipe to replace the cats. Any new catback will hook up to those. The term "Cat-Back" is just saying it replaces the exhaust from that location, back. Whereas an "Axel-Back" replaces just the part of the exhaust from the axle back.
Thanks man! Just out of curiosity, what is the sound difference like between the mid pipes and the cats? Which will be louder/more aggressive?
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Old 11-03-2013, 07:52 PM   #12
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Thanks man! Just out of curiosity, what is the sound difference like between the mid pipes and the cats? Which will be louder/more aggressive?
Honestly, there's not gonna be much of a difference. Hi flow cats nowadays literally flow so good that there's not enough resistance there to make a big difference. You MIGHT see 2-3HP more with a cat-less version after tune, than high flow catted. BUT those high flow cats will do wonders when it comes to the smell of the exhaust, also will reduce emissions. I think it's an excellent trade off for only 2-3 hp. I wouldn't be able to take the smell of cat-less. I had a 94 Firebird that was cat-less, I couldn't stand it. But that's my $0.02. Certainly do more research and make an educated decision.
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Old 11-03-2013, 07:54 PM   #13
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Thanks man! Just out of curiosity, what is the sound difference like between the mid pipes and the cats? Which will be louder/more aggressive?
If you dont have to worry about emissions inspections and want loud definitely go catless.
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Old 11-03-2013, 08:07 PM   #14
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If you dont have to worry about emissions inspections and want loud definitely go catless.
Hmmmm ill have to think about that. Thank you for the help though!
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Old 11-03-2013, 08:09 PM   #15
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Honestly, there's not gonna be much of a difference. Hi flow cats nowadays literally flow so good that there's not enough resistance there to make a big difference. You MIGHT see 2-3HP more with a cat-less version after tune, than high flow catted. BUT those high flow cats will do wonders when it comes to the smell of the exhaust, also will reduce emissions. I think it's an excellent trade off for only 2-3 hp. I wouldn't be able to take the smell of cat-less. I had a 94 Firebird that was cat-less, I couldn't stand it. But that's my $0.02. Certainly do more research and make an educated decision.
So if I ordered the option with cats, would those be high flow cats or I would I have to get that seperate?
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Old 11-03-2013, 08:21 PM   #16
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Kook long tube headers question? Also loudest cat back exhaust?

Kooks Headers with High Flow Cats. you want the cats. here is my set up with Kooks Headers + High Flow Cats and Borla Atak cat-back.
http://youtu.be/T4TcrQHoPqs
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Old 11-03-2013, 08:33 PM   #17
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So if I ordered the option with cats, would those be high flow cats or I would I have to get that seperate?
They would be high flows that come with the headers.
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Old 11-03-2013, 08:34 PM   #18
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Kooks Headers with High Flow Cats. you want the cats. here is my set up with Kooks Headers + High Cats and Borla Atak cat-back.
http://youtu.be/T4TcrQHoPqs
post up a video of some drive bys/fly bys!!!! That is the EXACT setup I want to go with eventually...
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Old 11-03-2013, 08:54 PM   #19
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post up a video of some drive bys/fly bys!!!! That is the EXACT setup I want to go with eventually...
I wish I could haha I get my car back tomorrow from the shop. Getting cammed. it will sound completely different! but honestly it sounds so great at WOT. If you do the Kooks/Borla setup you won't regret it.
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Old 11-03-2013, 09:41 PM   #20
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I wish I could haha I get my car back tomorrow from the shop. Getting cammed. it will sound completely different! but honestly it sounds so great at WOT. If you do the Kooks/Borla setup you won't regret it.
Damn.. that's even better.... DEFINITELY post up some idle, drive by, WOT, and FLY by vids when you get it back!!!

OP, Sorry to But hearing his setup may help you decide!
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Old 11-04-2013, 02:42 PM   #21
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KOOKS has changed up their part #'s a bit. Now it's less confusing and if you want headers with high flow cats, it's all in one part # (6511-OEMC) If you want catless connection pipes you go with Part # 6511-OEMO. Either setup will hook directly up to your factory or aftermarket exhaust system

I recommend going with cats not only for emissions but the exhaust will be raspy without them.

As for the Exhaust, check out the Stainless work Retro and the Magnaflow Comp series

Please feel free to call, PM or email me anytime with questions or for the best price.

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Old 11-04-2013, 03:13 PM   #22
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The Dynomax Bullet 3" dual system is the loudest I've heard that's not raspy...but it's REALLY loud and you'll probably get sick of it...I know I did.

The Kooks system is pricey but it really sounds nice, and it is definitely NOT quiet (mine was quieter for a few days, but it broke in and is pretty loud).
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Old 11-05-2013, 08:50 PM   #23
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Thanks man! Just out of curiosity, what is the sound difference like between the mid pipes and the cats? Which will be louder/more aggressive?
I was wondering the same thing... yet have heard that there is no difference and then i also hear catless is louder. Was wanting to make my camaro louder and was thinking if it made it louder id take the HFCs off. But im pretty sure im not gonna be happy untill i cam it.
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Old 11-06-2013, 09:04 AM   #24
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I was wondering the same thing... yet have heard that there is no difference and then i also hear catless is louder. Was wanting to make my camaro louder and was thinking if it made it louder id take the HFCs off. But im pretty sure im not gonna be happy untill i cam it.
catless gives a raspier tone and will smell terrible. you may gain a few horses but they aren't really worth the smell.
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Old 11-06-2013, 11:48 AM   #25
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I was wondering the same thing... yet have heard that there is no difference and then i also hear catless is louder. Was wanting to make my camaro louder and was thinking if it made it louder id take the HFCs off. But im pretty sure im not gonna be happy untill i cam it.
The difference in power is minimal; maybe 2-3 HP.. The biggest difference is the sound. Catless tends to be very raspy and does not sound good at all IMO. Then there is the smell, which I could live with but the rasp is the killer for me.

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