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Discussion Starter #1
Which fuse do you pull to disable the dual mode exhaust on the 2013 SS 1LE? I go to pick mine up Monday and want to know how to disable the exhaust valves.
 

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Its in the trunk. You have to pull the molding off the right side of the trunk. The owners manual in the fuse section will show you how to get to it and also which one to pull. If memory serves me correctly its the fuse on the top right.
 

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what does this do? what are you actually disabling?
 

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You are disabling the solenoid that controls the exhaust valves (butterflies) putting them in the open position permanently.
Okay, for the non-mechanically inclined trying to learn ... Exhaust value butterflies are part of the valves within the engine or part the actual exhaust (or something else) ... I'm assuming the former, and if it is, I probably don't really need any more explanation, but if it is part of the exhaust system, why would there be any butterflies at all? and, if it is something else, what?
 

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Okay, for the non-mechanically inclined trying to learn ... Exhaust value butterflies are part of the valves within the engine or part the actual exhaust (or something else) ... I'm assuming the former, and if it is, I probably don't really need any more explanation, but if it is part of the exhaust system, why would there be any butterflies at all? and, if it is something else, what?
The butterfly valves I'm talking about are actually in the exhaust pipes. Right before the mufflers IIRC.... You need these valves to get the different exhaust notes. This is what makes the "Bi-Modal" exhaust Bi-Modal (two mode) and what tones it down at the lower RPM. The solenoid activates and opens the butterfly valves at a given RPM thereby allowing more flow and thru an additional path within the muffler for the louder tone.... Think of it as being kind of like cutouts but with mufflers.
 

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The butterfly valves I'm talking about are actually in the exhaust pipes. Right before the mufflers IIRC.... You need these valves to get the different exhaust notes. This is what makes the "Bi-Modal" exhaust Bi-Modal (two mode) and what tones it down at the lower RPM. The solenoid activates and opens the butterfly valves at a given RPM thereby allowing more flow and thru an additional path within the muffler for the louder tone.... Think of it as being kind of like cutouts but with mufflers.
Thanks ... I was hoping that wasn't what it was, because that makes little sense... I understand your description, but I do not understand why they would do anything at all to restrict the flow of exhaust out of the car. I guess an additional pipe through the muffler helps at that rpm but then why not have it open all the time? too loud? interesting.
 

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Discussion Starter #9
Boy you guys are off lol. The exhaust valves I'm speaking of aren't the engine ones. I'm talking about the valves in the exhaust. They are after the mufflers and can be seen when you look into the tail pipes from the back of the car. They were installed the tame the exhaust note down a bit at low throttle so it would pass government mandates. When the engine goes full throttle, the valves open and let the exhaust fully open.
I just want to open them and get the full benefit and sound from the exhaust.
 

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Ok as someone who has NPP exhaust and has done the pull let me explain. By pulling the fuse in the trunk it basically doesn't allow the butterfly valve (which is after the muffler) to close after the the car is started. It is defaulted open at engine start. So by pulling the fuse it just keeps it open. The butterfly valves only use is to open at higher RPM's so during normal operation of the vehicle it is quieter running in the car and outside. I personally like the sound of it better with the fuse out. It will no pull any codes or effect normal operation.
 

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Ok as someone who has NPP exhaust and has done the pull let me explain. By pulling the fuse in the trunk it basically doesn't allow the butterfly valve (which is after the muffler) to close after the the car is started. It is defaulted open at engine start. So by pulling the fuse it just keeps it open. The butterfly valves only use is to open at higher RPM's so during normal operation of the vehicle it is quieter running in the car and outside. I personally like the sound of it better with the fuse out. It will no pull any codes or effect normal operation.
I was wondering if you could give any kind of insight as to how much more drone inside the car is present during normal driving after you did the fuse pull. I pulled it and then started it in my garage so I could rev it and see what it sounded like but then I put the fuse back in because I don't want a ton of drone inside the car during normal driving.

Thanks.
 

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thanks guys that helps a lot
 

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Discussion Starter #15
I'm glad you've helped them out but I've still not figured out which fuse it is. Guess ill have to just peel it open and look for myself...
 

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If you open up the vehicle manual to the fuse section it will show you exactly what you need to do. It is labeled with the fuse diagram and it shows you how to get to it.
 

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So I do need to start the car before I pull the fuse, correct? Or just turn the key on? Didn't really want this exhaust but it was already on the car and I got a killer deal. '13 Summit White 1SS.
 

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The valves are defaulted open so all you need to do is pull the fuse with the power off, it doesn't close until the car starts.
 
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