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Old 01-01-2012, 12:07 PM   #1
BrandX
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Question for those with LT headers

I am thinking about a set of long tube headers for my 2012 LS3 SS. In the past with similar type of upgrades with other vehicles, I noticed some extra noise with LT headers. I am not talking about increased exhaust tone. What I am referring to is noise from the headers themselves consisting of "Ring" or extra noise from the exhaust rushing through the headers (people who know cars will know what I'm talking about) . I actually find it kind of annoying and was wondering if I could expect that from this car. I know material and construction has alot to do with the noise, so any suggestions or opinions are appreciated.

My other thought is to keep the stock manifolds and add a set of Solo High flow Cats. I think the gains would be close.

Thanks for the input.
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Last edited by BrandX; 01-01-2012 at 12:08 PM. Reason: edit
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Old 01-01-2012, 12:48 PM   #2
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The will certainly give more noise - a sharp 'ring' as you call it - at idle its not much but gets louder from there.
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Old 01-01-2012, 12:54 PM   #3
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Try your best to ensure that all the bolts and brackets are tightened, other that it's just part of hot rodding!! Lol
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Old 01-01-2012, 01:55 PM   #4
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The reason I asked this is becuase the car is very refined and quiet for what it is on the road. Hoping to keep some of the NVH out of the equation.

NVH= Noise/Vibration/Harshness
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Old 01-01-2012, 02:50 PM   #5
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Less NVH and our hobby to modify these cars DO NOT go hand in hand period. If you want to increase the horse power from your camaro then forget about
1. cold air kit because that will make you actually hear the air coming in. FORGET IT

2. Headers forget that too more power more air more noise from your stock exhaust, the tubes will amplify your valve train noise too. AND no solo cats will NOT have the same power results as LT headers SORRY if someone misinformed you. FORGET IT

3. Catback? No because obviously you will increase the noise levels drastically (compared to stock).

YOur ONLY option my friend is "keep it stock and add lots of dynomat".
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Old 01-01-2012, 02:52 PM   #6
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Coated dynatechs with out cats and zero extra noise up front.
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Old 01-01-2012, 02:56 PM   #7
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I have noticed what sounds like more valvetrain noise after my LT headers and thought maybe something was going wrong. Is it true that the headers will ampliy that noise? That is good to know if true. I have not noticed any ring as stated but I do have a CAI and that plus the exhaust is all I hear when on the gas
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Old 01-01-2012, 03:49 PM   #8
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It's louder, no question. From the front of my car the valve train noise is louder than the exhaust at idle and my exhaust is LOUD. I also hear the exhaust flow at normal rpms; it is also noticeable above the highway/wind noise at 80. If you listen for it, which it sounds like you would, you will notice it. It's not bad, just noticeable.

That said, I've heard that the ceramic coating option reduces this noise by a considerable degree. I'd find someone local with your build options and ask them to check out their car.
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Old 01-01-2012, 04:44 PM   #9
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My car as well as others I have ridden in that have headers are louder all the way around. Some have weird noises coming from the engine bay as well. Soon as I started modding, the refinedness went out the door.
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Old 01-01-2012, 06:11 PM   #10
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Quote:
Originally Posted by litle88 View Post
Less NVH and our hobby to modify these cars DO NOT go hand in hand period. If you want to increase the horse power from your camaro then forget about
1. cold air kit because that will make you actually hear the air coming in. FORGET IT

CAI's do not add the type of noise I am talking about. CAI is on the list of mods coming to this car and they do not add any noise unless you are on the gas!!!!!

2. Headers forget that too more power more air more noise from your stock exhaust, the tubes will amplify your valve train noise too. AND no solo cats will NOT have the same power results as LT headers SORRY if someone misinformed you. FORGET IT

Headers can work if they are quality units. I know there will be extra noise and I'm cool with that as long as it is manageable.

3. Catback? No because obviously you will increase the noise levels drastically (compared to stock).

A good sounding exhaust with no drone is also acceptable.

YOur ONLY option my friend is "keep it stock and add lots of dynomat".
I'm not doing sound deadening.

Look I know headers will add noise. What I'm looking for is if it is really noticeable in this car. I do like to carry on a conversation while I drive sometimes.
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Old 01-01-2012, 06:17 PM   #11
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Quote:
Originally Posted by geaux_tigerss View Post
It's louder, no question. From the front of my car the valve train noise is louder than the exhaust at idle and my exhaust is LOUD. I also hear the exhaust flow at normal rpms; it is also noticeable above the highway/wind noise at 80. If you listen for it, which it sounds like you would, you will notice it. It's not bad, just noticeable.

That said, I've heard that the ceramic coating option reduces this noise by a considerable degree. I'd find someone local with your build options and ask them to check out their car.
Is the ceramic coating the same as the Jet Coat that some get on there Kooks?
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Old 01-01-2012, 06:28 PM   #12
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Quote:
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I'm not doing sound deadening.

Look I know headers will add noise. What I'm looking for is if it is really noticeable in this car. I do like to carry on a conversation while I drive sometimes.
i am 100% satisfied with sw 2" headers going down the interstate my car is no louder than stock and they added unbelieveble power i went with no cats and left stock from there back because i dont want a loud car i just wanted the extra power, it dont get loud until WOT. hope this helps
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Old 01-01-2012, 06:54 PM   #13
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Quote:
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I'm not doing sound deadening.

Look I know headers will add noise. What I'm looking for is if it is really noticeable in this car. I do like to carry on a conversation while I drive sometimes.
Keep it stock - if you want performance, go the FI route with stock exhaust manifolds, cats, mufflers.....
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Old 01-01-2012, 07:16 PM   #14
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Stainless is not as thick as the cast iron manifolds, so you do get a small pinging sound from the front of the car after installing them. I have never found this to be a big deal because it is really not very loud or anoying. Cats helps keep the sound down some to.
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Old 01-01-2012, 07:47 PM   #15
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Quote:
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Stainless is not as thick as the cast iron manifolds, so you do get a small pinging sound from the front of the car after installing them. I have never found this to be a big deal because it is really not very loud or anoying. Cats helps keep the sound down some to.

An answer I was looking for. They will be catted so that would help. I have heard some that were loud.
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Old 01-01-2012, 08:33 PM   #16
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Coversation and radio present NO ISSUES with headers. Even paired with catback exhaust, I have no problems with loudness. It's noticeable, not problematic.
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Old 01-01-2012, 10:19 PM   #17
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Keep it stock - if you want performance, go the FI route with stock exhaust manifolds, cats, mufflers.....
i tried that i couldnt get the tune right with manifolds with FI it had a bad spark knock that i couldnt get out unless i cut the tune way back and for the money spent on FI i couldnt see cutting my car back that much because of manifolds, just a thought.
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Old 01-01-2012, 10:48 PM   #18
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In fact, let me go a little further. My wife is the first to let me know when she doesn't like my car. Amazingly she has yet to complain about my mods (in sig) and even told my mom that the car wasn't very loud on the inside. Of course the exterior volume is a whole separate issue .
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Old 01-01-2012, 11:06 PM   #19
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If you want the best of both worlds, meaning performance and sound, go with the lt's and high flow cats matted up to the rest of your factory exhaust. The factory cat back flows excellent and does the best job out of any cat backs in keeping things reasonable on a loudness level. Just what you want!!
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Old 01-02-2012, 12:42 AM   #20
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If you want the best of both worlds, meaning performance and sound, go with the lt's and high flow cats matted up to the rest of your factory exhaust. The factory cat back flows excellent and does the best job out of any cat backs in keeping things reasonable on a loudness level. Just what you want!!
+1

Here's a similar setup with some DT LTs (no cats) with a OEM Catback attached:




Enjoy!
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Old 01-02-2012, 06:40 AM   #21
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When I see these questions answered one thing everyone forgets seems to be that inside the car, even with the windows down there is not much noise, even with long tube headers. I have ARH long tubes and a "cat back system as well as a supercharger (centri) and the noise level inside the car with the windows up cruising is about the same as stock, a little louder with the windows down.
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Old 01-02-2012, 07:43 AM   #22
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Keeping the factory cat back installed will help keep the drone out of the cabin as well.

Try to find others in your area with different systems and go for a ride. That is by far the easiest (and cheapest) way to find the sound (or lack of) that your looking for to match the performance gains.


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Old 01-02-2012, 07:49 AM   #23
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I think the ping is part of the expansion process when it's hot or cooling. I kinda like it.
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Old 01-02-2012, 08:07 AM   #24
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I think the ping is part of the expansion process when it's hot or cooling. I kinda like it.


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Old 01-02-2012, 04:50 PM   #25
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The tubing of a header is going to be much thinner than cast iron, so there is going to be more engine noise transmitted into the car.

With the LS engines I have typically heard more valve train noise than anything else with the cars.

Installing cats, keeping the factory mufflers.....all of these will help keep the car on the quiet side of things. One other thing, and I'm not huge on this, is coating. Doing a good coating on the headers will also slightly quiet the pipes down a bit for you.
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