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Old 04-17-2013, 11:55 PM   #18
layzurguy
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I just spot-welded mine open (after muffler delete), Much better full range sound at idle.
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Old 05-30-2013, 12:28 PM   #19
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I believe I have experienced this problem. I brought mine to the dealer and they told me there was a programming update that they did. Service guy said that it may or may not resolve the problem entirely, and that if it didn't, there was no fix for it. It seems to have fixed the problem as of right now, but not sure if it's a permanent fix. Glad to have found this information though.
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Old 05-30-2013, 12:57 PM   #20
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This is for the L99 only. My LS3 vert does not have these.
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Old 06-11-2013, 10:42 PM   #21
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I have new borla ateck all the way back. New borla headers and tune. What a differance in sound. They know your coming but very quite on the expressway.

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Old 06-12-2013, 04:24 AM   #22
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Would the Range AFM disable unit help keep the butterfly valves open all the time? If not, what is the best way to keep them open without putting in a new exhaust system? Any disadvantages to getting rid of the valves or having them permanetly open? Thanks in advance.
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Old 06-12-2013, 02:56 PM   #23
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Originally Posted by SS PANTHER View Post
Would the Range AFM disable unit help keep the butterfly valves open all the time? If not, what is the best way to keep them open without putting in a new exhaust system? Any disadvantages to getting rid of the valves or having them permanetly open? Thanks in advance.
No, the exhaust baffles are not computer controlled or anything. Those butterfly valves are only opened when there is enough exhaust pressure (ie. RPMs).

On the other hand, you can either cut them out or simply wire them open if you have the Range AFM disabler installed, as they are designed to reduce the coffee grinder noise you get when the L99 engine goes into 4 cylinder mode.
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Old 06-12-2013, 02:59 PM   #24
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No, the exhaust baffles are not computer controlled or anything. Those butterfly valves are only opened when there is enough exhaust pressure (ie. RPMs).

On the other hand, you can either cut them out or simply wire them open if you have the Range AFM disabler installed, as they are designed to reduce the coffee grinder noise you get when the L99 engine goes into 4 cylinder mode.
Thanks for the info.
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Old 06-12-2013, 06:20 PM   #25
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Originally Posted by sswiss3000 View Post
No, the exhaust baffles are not computer controlled or anything. Those butterfly valves are only opened when there is enough exhaust pressure (ie. RPMs).

On the other hand, you can either cut them out or simply wire them open if you have the Range AFM disabler installed, as they are designed to reduce the coffee grinder noise you get when the L99 engine goes into 4 cylinder mode.

Explain "wire them open". I was going to find some to weld them open. If I can "wire them open" myself I would rather go that route first.
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Old 06-12-2013, 06:40 PM   #26
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Everything is normal just like the convertible tops.
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Old 06-12-2013, 11:05 PM   #27
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Explain "wire them open". I was going to find some to weld them open. If I can "wire them open" myself I would rather go that route first.
Cam62,

As I just wanted to see what it would sound with the baffles open, I simply took a long wire and wrapped one end around one of the metal tabs on the out side of the Springs. Then I manually twisted the valve open and strapped the other end of the wire to the exhaust hook at the very back end of the car. This way the wire holds the valve at the open position

Admittingly, this method could be considered a "bit" low tech , but it works and can be easily reversed at any time.
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Old 06-13-2013, 10:21 AM   #28
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Originally Posted by sswiss3000 View Post
Cam62,

As I just wanted to see what it would sound with the baffles open, I simply took a long wire and wrapped one end around one of the metal tabs on the out side of the Springs. Then I manually twisted the valve open and strapped the other end of the wire to the exhaust hook at the very back end of the car. This way the wire holds the valve at the open position

Admittingly, this method could be considered a "bit" low tech , but it works and can be easily reversed at any time.
So was the sound louder/better ?
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Old 06-13-2013, 11:29 AM   #29
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How would i fix the exhaust rattle noise??? I have an aftermarket exhaust and it still rattles at idle & low speeds
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Old 06-13-2013, 12:33 PM   #30
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Originally Posted by pannhead51 View Post
So was the sound louder/better ?

Well, As long as you have the AFM active it does make some odd noises when it kicks in. For me the engine seemed to exhale a bit less restricted, but not worth it as long as AFM is active.
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Old 06-13-2013, 12:35 PM   #31
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How would i fix the exhaust rattle noise??? I have an aftermarket exhaust and it still rattles at idle & low speeds

The dealer will simply install two "O" rings around each spring. The source of the rattle noise is the spring it self. So their solution is to put two o rings around each spring which keeps it from bouncing back and forth when they are closed (not under tension).
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