TEECEE

So where is fuse # 10 in my 2011 GS? I heard I can pull it so my exhaust is open all the time. Under the hood or under the panel in passenger cockpit??

383LPE

mine was under the foot panel in passenger cockpit

Vette_DD

That's where it is, near the bottom of the panel, right side, not sure how it's labeled.

383LPE

BTW, I put the fuse back in almost immediately. I couldn't sense any discernible benefit in exhaust note and wanted to maintain some backpressure for proper torque.

haljensen

Couldn't sense any discernible benefit in exhaust note?

Sounding like a performance V8 isn't a benefit over sounding like a 4 cylinder import?

Backpressure for proper torque?

Not enough backpressure difference for Chevy to change computer fuel/spark settings between open and closed.

383LPE

as soon as you marginally put your foot on the pedal its all open anyway. the idea that good ole boy engineering like pulling a fuse is a waste of time and an insult to GM engineers.

OldCorvetteFan

Not so. It will open at ~3500 RPM or when the vacuum signal drops enough (like a full throttle launch).

If you can't hear the difference, maybe your's isn't closing to start with.

I have the M2W foot switch, and there's a clear and discernible difference in the sound - both at low speeds and highway speeds.

As to pulling the fuse being an insult to the GM Engineers, perhaps they had the brains to see what their customers would want, and gave us an easy way to get the sounds that many of us crave (except when the better half is in the car).

This short video shows the valves closed and open - and it seems obvious to me when they open.

Steven

cheetah45

I pulled my fuse in July to see what it was like, and it is still out today. Been too lazy to get a Mild 2 Wild switch.

FortMorganAl

The reason there is an NPP option is federal law has noise standards for cars and trucks ( http://www.fhwa.dot.gov/environment/noise/ ).The Corvette couldn't pass those standards with open mufflers. What to do, what to do. OK, there is a loophole that the law applies to driving past a measuring station at various speeds. It doesn't say you have to accelerate past the station. So if we keep it quiet at low RPM we can pass the test and then open it up under acceleration, we can give our customers what they want no matter what the tree-huggers say. Yes, back pressure will change the way an engine operates and at times, more pressure can mean more torque. But the C6 engines were designed for very little back pressure to begin with. In this case, opening the second pair of mufflers increases torque at least at high RPM as evidenced by the 6hp increase claimed for NPP.

I'm thinking the GM engineers wanted people to discover that fuse. It would have been less expensive and easier to just tap into an existing circuit for power. But they allocated a separate fuse for NPP. Then they made the system normally open so that it would be noisy with no power rather than require power to open it up. It would have been very drivable and more compliant with the intent of the law to make it need power to open. But they knew GM wouldn't be in trouble for making a car that broke the law if it only broke the law in a failure condition. The government would be in a bad legal position if they try to say the car has to obey the law even with failed components. GM built a car that would pass the legal requirements. If it "fails" due to improper maintenance by the owner (not replacing a blown fuse) that isn't GM's fault. wink, wink, nudge, nudge.

blittle

100% agree!

glerma

Call it what you will... I have a M@W switch for one reason.... The sound. It does make a difference. A huge one.

rckt

I have the foot M2W switch for sale $35.

WICKEDFRC

Yes - there is a difference. And it is not so overly obnoxious when your Corvette is still stock as compared to open with cam/headers, etc.

I think it sounds much better with the Fuse #10 Pulled, allowing the butterfly valves to be in the always open position.

jwf

The fuse is under the floor mat in the passenger side footwell. There is a noticible difference in sound with the fuse in or out but the difference is much less if you are sitting at idle. If you pull the fuse and the hit the accelerator a bit you can't miss the difference. If you still can't hear a difference then check to make sure you are pulling the correct fuse.

Not So Fast

New here so be kind My new to me, 2011 GS has a key fob that actuates the silent choice mode back and forth, doesn't it come with all Vettes ?
NSF

Don-Vette

I pulled the fuse the day I got my new GS home,hasn't been in since,it's an iconic American sports car,it should sound like one all the time. IMO

blittle

Yup!

blittle

No....the fob you have was part of an after market device called a "midl to wild" system that you can order and install your vehicle.....allows you to open and close the dampers on the exhaust system. Very simple to hook up!!

bamauto

MY 2012 C6 GS Fuse # 10 for the Dual Exhaust Mode keeps blowing..Seems like a dead short to ground.. Any Thoughts?