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Old 03-03-2012, 11:05 PM   #1
bmorecam
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For you guys with OBX long tube header

Anytime after installing your OBX header, do any of you notice any hissing noise slightly mixed with what sound like a hand shaker instrument being shaken while accelerating? It sound like hissing mixed with a bunch of hard rice being shaken in a can, almost like a rattle snake's tail. It can also go as sounding raspy. I been dealing with this noise for almost a year! and I still can't seem to find the reason why. I can't find any leaks either, and if I been dealing with almost a year worth of leak I'm sure I would be able to see at least a little bit of black soot shooting out but none. Some are saying it's because of the thin material the OBX is made from but if I'm the only one that's hearing this noise then it can't be that. So any of you other OBX guys going through this?

I also want to note that if you have a loud exhaust I'm sure you can't hear this. I have somewhat of a mild exhaust. Zero drone and very quiet when just cruising on the highway. The noise is not there when the windows are down but definitely noticeable when the windows are up and radio off.

Last edited by bmorecam; 03-03-2012 at 11:22 PM.
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Old 03-04-2012, 04:39 AM   #2
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I know this won't be much help at all and you're going to want to wait for a better answer, but i've read on here that the steel on the OBX's pipes are not as thick as others, and that's a big reason why they produce some noise that is, in some opinions, not as desirable.
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Old 03-04-2012, 05:38 AM   #3
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I have not heard anything like what you describe Jay. I have the MRT's and the X pipe and still have a some drone (now different than when I had just the MRT's), nothing that bothers me thou. I have no leaks. I will keep my ear out the next time I am driving to see if I hear anything. Does it happen at certain rpm's or speeds?
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Old 03-04-2012, 10:21 AM   #4
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Cat, the only time its audible is with the windows up and radio off. It usually happen whenever I drive with the gas on part throttle. The noise seem to be somewhat accompanied with the hiss. So basically drive normally with your windows up and radio off and you should hear it if its there.

graypearl, that's what a lot of peoples are saying and I hope that's the case. I hope that I'm not dealing with a hairpin leak that's going to be impossible to find without taking the header off because we all know its a real PITA dealing with headers on LLT.
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Old 03-04-2012, 11:31 AM   #5
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Just came back from going to the store and the noise seem to be really audible around 2300rpm with about 35-40% throttle and only while driving. Just listen for the air hissing and once you notice the hiss, see if you can hear what sound like hard rice being shaken in a shaker or almost like the rattle snake's tail that's accompanied with the hiss at different rpm. There's more hiss than the shaker sound. You have to really pay attention in a quiet cabin or you might not be able to hear it. If is warm in your area you might not be able to hear it at all but it should hiss though.
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Old 03-04-2012, 11:32 AM   #6
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It cant be a loose heat shield or something? I know longtubes all add rasp, wonder what this noise is your hearing. A hairpin leak will be beyond a PITA!
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Old 03-04-2012, 11:45 AM   #7
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No, it's not the rasp that we all know about from long tube header and exhaust. It's a hiss that usually get accompanied with what sound like bunch of hard rice being shaken in a wooden shaker like one of those morrocan hand shaker instrument. When those two noise get mixed together it can almost go as slight rasp. All this noise is coming directly from the engine area more towards the passenger side. I been dealing with this noise for almost a year and it seem like it just got a little louder and it's starting to get very annoying because the noise is very unnatural that I know it should not be there. The car run like a champ though and no CEL. I'm certain that it's because of this header and something is telling me that I have a weld that's cracked from the inside probably around the collector area where all the pipes join together or a small hairpin leak that's probably impossible to find. I was not expecting to change out my headers this soon but it look like I will have to unless I just deal with the noise.
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Old 03-04-2012, 12:12 PM   #8
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Old 03-04-2012, 04:12 PM   #9
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I've never noticed anything like this, but I'll try to take a listen the next few days
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Old 03-04-2012, 04:44 PM   #10
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I do have a hissing sound and a rattle. I know the problem with mine though. The hissing i do have a small leak still trying to fix and the rattle that ive found with mine is actaully the exahsut is hitting the heat shield. I belive the OBX header must sit a tad higher than the stock manifolds and under the torque my ark catback is tapping against the heat shield. Bmore one more thing to look at that i messed up the first time i put them on was which way the bolts face. I had to spin them because they were hitting the heat shield and you could see little indents in it from them tapping it. Just something you may want to look at.
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Old 03-04-2012, 06:25 PM   #11
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Thanks countryman.

Hope, are you sure you have a leak? Mine is not a rattle that's accompanied with the hiss. Its not the type of rattle as if a bolt or heat shield was lose. It's more like a rasp or static mixed with the hiss. I know for me its not the heat shield.

Its really not that loud but annoying enough to know its there. If you have a considerably loud exhaust you wont be able to hear it. If the window is down or even slightly cracked you can't hear it. Same if you have the radio on too.

I been doing lot's of Googling and what's crazy is that the peoples who seem to notice the same problem as me all have obx header or product. Everyone seem to have the hissing and in worst cases the same rattle snake and resonating sound accompanied with the hiss just like me. I been trying to figure this out for a long time and it doesn't look like im going to get anywhere again except for just taking it as being normal again or just take it as a loss and replace my header.

I guess I'll just keep looking for leaks and miraculously I can come up with an answer.
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Old 03-04-2012, 06:33 PM   #12
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dam it so this is a bad idea then to get ..
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Old 03-04-2012, 06:52 PM   #13
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yea i know the rattle in mine is very noticable but i do get a hiss that you can only hear when its quiet and i havent been able to fix that yet
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Old 03-04-2012, 06:56 PM   #14
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I had one issue with my OBX's The resinators (cant spell) came lose inside and it made a sound like that. I took them off and rewelded them.
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