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Old 08-08-2013, 09:21 PM   #1
OmniCamaro
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Help identify my exhaust annoyance!

Something is causing an annoying sound and I'm pretty sure I know what it is. I'd like some opinions to see if I'm on the right track or not. I've tried to cut down the video's to just the sound I'm talking about. Please take a listen and let me know what you think it may be.

2011 2SS/RS AUTO w/Dynatech headers, no cat's, stock cat-back w/ muffler delete. None of the exhaust is hitting anything, I've triple checked that. All bolts and fittings are tight and then retightened after a few days. Car is also tuned so no AFM/DOD.

It's best when heard/watched with some sort of headset/earbuds.

[youtube]O9LDyyXpk7w[/youtube]

[youtube]tueHIW3YMgo[/youtube]

Thanks!
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Old 08-08-2013, 09:28 PM   #2
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Old 08-08-2013, 09:30 PM   #3
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Embedded, sorry.
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Old 08-08-2013, 09:30 PM   #4
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Headers with no cats to stock exhaust right?
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Old 08-08-2013, 09:32 PM   #5
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Quote:
Originally Posted by 45thAnniversary2SS View Post
Headers with no cats to stock exhaust right?
Yep, stock "H" pipe :(
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Old 08-08-2013, 09:32 PM   #6
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Or whatever it is!
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Old 08-08-2013, 09:51 PM   #7
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I would take a look at the tunnel brace to make sure its not making contact with pipes. Also may want to check heat shield to make sure its not touching anywhere.
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Old 08-08-2013, 09:59 PM   #8
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I've shimmed the tunnel brace and didn't notice any shielding hitting anything but I suppose it's a possibility.
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Old 08-08-2013, 10:00 PM   #9
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In the car it sounds like puffing air. I'm thinking its the H pipe but not positive just yet.
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Old 08-08-2013, 11:30 PM   #10
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Exhaust leak maybe?
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Old 08-09-2013, 04:07 AM   #11
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Could it be the exhaust butterfly valves?
http://www.camaro5.com/forums/showthread.php?t=275303
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Old 08-09-2013, 05:58 AM   #12
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Quote:
Originally Posted by SS PANTHER View Post
Could it be the exhaust butterfly valves?
http://www.camaro5.com/forums/showthread.php?t=275303
Don't know if the op has a convertible with the L99. As far as I know these are the only camaros with the butterfly valves.

I hate that sound and I hear it much more often than the tsb says it is heard.

AFM doesn't belong on an ss :(.

Those will be deleted from mine as soon as I can afford new catback.
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Old 08-09-2013, 06:57 AM   #13
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Not a convertible. If it's an exhaust leak it has to be big but I guess anything is possible. I just can't imagine where it could be coming from at this point, I've triple checked all connections. I'm leaning towards that thing underneath the car right at the tunnel brace on the stock exhaust.
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Old 08-09-2013, 08:02 AM   #14
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Doesn't sound like it's hitting anything. That would be more of a metal on metal knocking noise. There would have to be something VERY loose to do that and you already said it's all tight. Can you replicate it with just revving the motor or do you need to be driving? Did it just start out of the blue or did you do anything before it started?
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