LT Header Hiss (Exhaust leak sound) - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

NinoSS · 01-16-2010, 06:58 PM

Those with LT's, does anyone have an annoying hissing sound under light throttle similar to an axhaust leak? I had Kooks LT's on my Jeep SRT8, and the sound drove me nuts. It was not a leak, just the sound of the engine due to thinner material than OEM manafolds... I don't want this in my 10' SS, but don't want to leave this HP on the table...

Any thoughts...

tjbusa · 01-16-2010, 07:17 PM

That does not appear to be an issue with the 2010 Camaro. That is provided you buy a quality header Like ARH, Kooks, SLP, ect.

Camar0wn3d · 01-16-2010, 07:53 PM

I know what the OP is talking about, I had that sound on my 02 camaro with Kooks headers and it bothered the crap outta me too. With the Kooks on my 2010 I haven't really noticed that sound, it may be there from time to time but its not bad at all, and only at really low RPM's. Even if it does make the same sound, it doesn't go beyond the engine compartment.

Go for the headers...

CWI · 01-16-2010, 07:59 PM

Quote:

Originally Posted by wh0rsep0wer

I know what the OP is talking about, I had that sound on my 02 camaro with Kooks headers and it bothered the crap outta me too. With the Kooks on my 2010 I haven't really noticed that sound, it may be there from time to time but its not bad at all, and only at really low RPM's. Even if it does make the same sound, it doesn't go beyond the engine compartment.

Go for the headers...

I've got ARH LTs and don't have the problem. As for low RPM, with the cam and tune I can't drive below 1200 RPM anyway.

NinoSS · 01-17-2010, 03:15 PM

Quote:

Originally Posted by wh0rsep0wer

I know what the OP is talking about, I had that sound on my 02 camaro with Kooks headers and it bothered the crap outta me too. With the Kooks on my 2010 I haven't really noticed that sound, it may be there from time to time but its not bad at all, and only at really low RPM's. Even if it does make the same sound, it doesn't go beyond the engine compartment.

Go for the headers...

The sound was very prevelant when next to a cement divider or going through town with building on both sides of the car. As I said in the OP I ran Kooks headers with high flow cats, these were very nice (and very expensive). Perhaps it was a charicteristic of the HEMI???

JHart · 01-17-2010, 08:57 PM

i wish there was a header that didn't make that high rasp sound in the upper rpm's. it's something i don't too much care for.

tjbusa · 01-17-2010, 09:55 PM

Quote:

Originally Posted by JHart

i wish there was a header that didn't make that high rasp sound in the upper rpm's. it's something i don't too much care for.

Sound was a defining factor with SLP.

JHart · 01-17-2010, 10:18 PM

i wanna hear your exhaust in person tjbusa. reason being is that the lmII is an exhaust i'm seriously looking at, and i'm thinking about getting the slp crossover pipe also. just would like to hear it in person.

robertway · 03-10-2010, 03:20 PM

Just wanted to resurrect this thread because I just installed my Kooks this past week and was out on the highway today and all I could do was notice that annoying hissing sound. Of course you can't hear it with music on but I drive A LOT with talk radio on so I can hear it. At this point it is enough for me to just say I can do without the added HP of the LT's because when the wife gets in the car I think her complaining is going to be more annoying than the hissing sound. At first I thought it was a leak but now that I know this is a known "side effect" of some headers they may be going into the classifieds section.

NinoSS · 03-10-2010, 03:32 PM

Quote:

Originally Posted by robertway

Just wanted to resurrect this thread because I just installed my Kooks this past week and was out on the highway today and all I could do was notice that annoying hissing sound. Of course you can't hear it with music on but I drive A LOT with talk radio on so I can hear it. At this point it is enough for me to just say I can do without the added HP of the LT's because when the wife gets in the car I think her complaining is going to be more annoying than the hissing sound. At first I thought it was a leak but now that I know this is a known "side effect" of some headers they may be going into the classifieds section.

I hated the sound on my SRT8. While the HP was awesome the sound was not...

mwt18 · 03-10-2010, 04:52 PM

Quote:

Originally Posted by robertway

Just wanted to resurrect this thread because I just installed my Kooks this past week and was out on the highway today and all I could do was notice that annoying hissing sound. Of course you can't hear it with music on but I drive A LOT with talk radio on so I can hear it. At this point it is enough for me to just say I can do without the added HP of the LT's because when the wife gets in the car I think her complaining is going to be more annoying than the hissing sound. At first I thought it was a leak but now that I know this is a known "side effect" of some headers they may be going into the classifieds section.

Did you reuse the stock gaskets or use the ones provided with the headers?

robertway · 03-10-2010, 06:06 PM

I re-used the stock gaskets, was informed that the Kooks ones were prone to leaking over time. I don't think there is anything unusual coming from up front. I figured I would hear the exhaust flowing a little more up front but the hiss coming from the rear is pretty annoying. I intend to go out in the morning and loosen up the bolts from the headers to the cats and the cats to the stock cat-back pipes to make sure they are no leaks even though I can't detect anything now. In talking with the shop I go them from, they mentioned that they had heard of others with the Kooks mated up to the stock mid-pipes and mufflers were hearing the same thing. The hiss is most prevalent when cruising on the highway and you give it just a little bit of gas to maybe pass someone slowly or to maintain speed on an incline. Not sure if it is there under harder acceleration because the loudness of the exhaust drowns everything out at that point.

This is my first experience with Long Tubes so I wasn't really sure what I was in for hence the "what is this hissing sound" question...

mwt18 · 03-10-2010, 07:16 PM

Quote:

Originally Posted by robertway

I re-used the stock gaskets, was informed that the Kooks ones were prone to leaking over time. I don't think there is anything unusual coming from up front. I figured I would hear the exhaust flowing a little more up front but the hiss coming from the rear is pretty annoying. I intend to go out in the morning and loosen up the bolts from the headers to the cats and the cats to the stock cat-back pipes to make sure they are no leaks even though I can't detect anything now. In talking with the shop I go them from, they mentioned that they had heard of others with the Kooks mated up to the stock mid-pipes and mufflers were hearing the same thing. The hiss is most prevalent when cruising on the highway and you give it just a little bit of gas to maybe pass someone slowly or to maintain speed on an incline. Not sure if it is there under harder acceleration because the loudness of the exhaust drowns everything out at that point.

This is my first experience with Long Tubes so I wasn't really sure what I was in for hence the "what is this hissing sound" question...

IC.. I thought the sound was coming from under the hood, but if it's coming from underneath, definitely not a gasket issue.. You did right by reusing the stock gaskets though.
Are your headers coated?

El Chorizo · 03-10-2010, 07:30 PM

Guys, I had this issue with Kooks headers on my SRT8 as well. The issue (I believe) has to do with the wall thickness of the headers and just a side-effect. It's not a leak, but the sound of the exhaust kind of bouncing off of the stainless steel. You get used to it, but yes I agree... I hate the sound of exhaust leaks and this is a similar sound :(

01-16-2010, 06:58 PM	#1
NinoSS Drives: 2SS/RS CGM LS3 Join Date: Aug 2009 Location: NJ Posts: 1,619	LT Header Hiss (Exhaust leak sound) Those with LT's, does anyone have an annoying hissing sound under light throttle similar to an axhaust leak? I had Kooks LT's on my Jeep SRT8, and the sound drove me nuts. It was not a leak, just the sound of the engine due to thinner material than OEM manafolds... I don't want this in my 10' SS, but don't want to leave this HP on the table... Any thoughts...

01-16-2010, 07:17 PM	#2
tjbusa Serious Sleeper Drives: 2010 CGM 2SS/RS M6 Join Date: Nov 2008 Location: Lexington,SC Posts: 3,129	That does not appear to be an issue with the 2010 Camaro. That is provided you buy a quality header Like ARH, Kooks, SLP, ect. __________________ ************************************* Drive-by Fact of Life: After Monday and Tuesday even the calendar reads... W T F *************************************

01-16-2010, 07:53 PM	#3
Camar0wn3d formerly "wh0rsep0wer" Drives: 2016 1SS Summit White Join Date: Oct 2008 Location: Myrtle Beach, SC Posts: 489	I know what the OP is talking about, I had that sound on my 02 camaro with Kooks headers and it bothered the crap outta me too. With the Kooks on my 2010 I haven't really noticed that sound, it may be there from time to time but its not bad at all, and only at really low RPM's. Even if it does make the same sound, it doesn't go beyond the engine compartment. Go for the headers... __________________ 2010 1SS/RS - CGM/Gray Interior - M6 (SOLD) Kooks 1 7/8" headers, Solo Mach-X, Vararam. 2012 2LS - Black A6 (SOLD) 2016 1SS Summit White A8

01-17-2010, 08:57 PM	#6
JHart I haz camaro again :) Drives: 2010 Chevrolet Camaro 1SS Join Date: Mar 2009 Location: Union, South Carolina Posts: 660	i wish there was a header that didn't make that high rasp sound in the upper rpm's. it's something i don't too much care for. __________________ 2010 Camaro 1SS(back in a camaro again, yessssss!) 2010 silverado z71 ccsb(sold, old dd) 2010 camaro1ss(sold, missed, will have another someday)

01-17-2010, 10:18 PM	#8
JHart I haz camaro again :) Drives: 2010 Chevrolet Camaro 1SS Join Date: Mar 2009 Location: Union, South Carolina Posts: 660	i wanna hear your exhaust in person tjbusa. reason being is that the lmII is an exhaust i'm seriously looking at, and i'm thinking about getting the slp crossover pipe also. just would like to hear it in person. __________________ 2010 Camaro 1SS(back in a camaro again, yessssss!) 2010 silverado z71 ccsb(sold, old dd) 2010 camaro1ss(sold, missed, will have another someday) Last edited by JHart; 01-17-2010 at 10:36 PM.

03-10-2010, 03:20 PM	#9
robertway Drives: 2012 Challenger SRT8 Auto Join Date: Sep 2009 Location: Central New Jersey Posts: 839	Just wanted to resurrect this thread because I just installed my Kooks this past week and was out on the highway today and all I could do was notice that annoying hissing sound. Of course you can't hear it with music on but I drive A LOT with talk radio on so I can hear it. At this point it is enough for me to just say I can do without the added HP of the LT's because when the wife gets in the car I think her complaining is going to be more annoying than the hissing sound. At first I thought it was a leak but now that I know this is a known "side effect" of some headers they may be going into the classifieds section. __________________ "When the people find they can vote themselves money, that will herald the end of the republic." - Benjamin Franklin LS3 Camshaft Swap Do-It-Yourself Instructions - 2010 LS3 gone but not forgotten!!!

03-10-2010, 06:06 PM	#12
robertway Drives: 2012 Challenger SRT8 Auto Join Date: Sep 2009 Location: Central New Jersey Posts: 839	I re-used the stock gaskets, was informed that the Kooks ones were prone to leaking over time. I don't think there is anything unusual coming from up front. I figured I would hear the exhaust flowing a little more up front but the hiss coming from the rear is pretty annoying. I intend to go out in the morning and loosen up the bolts from the headers to the cats and the cats to the stock cat-back pipes to make sure they are no leaks even though I can't detect anything now. In talking with the shop I go them from, they mentioned that they had heard of others with the Kooks mated up to the stock mid-pipes and mufflers were hearing the same thing. The hiss is most prevalent when cruising on the highway and you give it just a little bit of gas to maybe pass someone slowly or to maintain speed on an incline. Not sure if it is there under harder acceleration because the loudness of the exhaust drowns everything out at that point. This is my first experience with Long Tubes so I wasn't really sure what I was in for hence the "what is this hissing sound" question... __________________ "When the people find they can vote themselves money, that will herald the end of the republic." - Benjamin Franklin LS3 Camshaft Swap Do-It-Yourself Instructions - 2010 LS3 gone but not forgotten!!!

03-10-2010, 07:30 PM	#14
El Chorizo Drives: 2006 Lamborghini Gallardo Join Date: Feb 2010 Location: Cedar Park, TX Posts: 248	Guys, I had this issue with Kooks headers on my SRT8 as well. The issue (I believe) has to do with the wall thickness of the headers and just a side-effect. It's not a leak, but the sound of the exhaust kind of bouncing off of the stainless steel. You get used to it, but yes I agree... I hate the sound of exhaust leaks and this is a similar sound :( __________________ 2010 Camaro 2SS, 700RWHP, 667RWTQ @ 9psi - 11.03@124 @ 3600 ft. elevation TVS2300, Ported Stock Heads, Ported TB, Comp Cam, RPS Twin Disk, Kooks 2" LT's, Kooks 3" Catback, Dual ZR1 Fuel Pumps, H&R Springs, Barton STS, Hendrix Axles, BMR Trailing Arms, Snow Methanol Kit, Rotofab CAI. 2006 Lamborghini Gallardo, 2006 Cherokee SRT8. 2014 Mercedes CLA (On Order) / CLA Forum

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