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NPP exhaust mod

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Old Jun 20, 2008 | 11:54 AM
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Default NPP exhaust mod

Which fuse to pull? The car won't be here till next week. I will order the GAGS eliminator from SCP.
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Old Jun 20, 2008 | 12:13 PM
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Originally Posted by KBoltz
Which fuse to pull? The car won't be here till next week. I will order the GAGS eliminator from SCP.
I have picture instructions on my site www.nakidparts.com that will show you but it's the bottom right in the pass foot well (10a and it's marked "exhaust")
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Old Jun 20, 2008 | 12:37 PM
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forget pulling the fuse - get one of Ed's M2W switches and you can have it both ways at a push of a button.
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Old Jun 20, 2008 | 12:56 PM
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Originally Posted by dpigguy
forget pulling the fuse - get one of Ed's M2W switches and you can have it both ways at a push of a button.
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Old Jun 20, 2008 | 12:58 PM
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Ed's, Mild2Wild is the best investment you can make!
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Old Jun 20, 2008 | 12:59 PM
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Originally Posted by dpigguy
forget pulling the fuse - get one of Ed's M2W switches and you can have it both ways at a push of a button.
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Old Jun 20, 2008 | 01:24 PM
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I put the mild to wild on yesterday and love it. "Sometimes I feel like a nut and sometimes I don't." For short trips I love the sound and for highway driving I like it quiet. Life with a Corvette is really good.
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Old Jun 20, 2008 | 01:26 PM
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Originally Posted by Max EPR
I put the mild to wild on yesterday and love it. "Sometimes I feel like a nut and sometimes I don't." For short trips I love the sound and for highway driving I like it quiet. Life with a Corvette is really good.
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Old Jun 20, 2008 | 01:29 PM
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how much is the NPP option from the factory?
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Old Jun 20, 2008 | 01:53 PM
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Originally Posted by F40
how much is the NPP option from the factory?
$1195.00 according to the window sticker - gives me the option of quiet for cruising and loud when I get on it. I prefer the loud all the time. My C4 has the muffler eliminators and I have an x-pipe in lieu of the factory resonator. Gets loud on the highway at times, but that's what the stereo is for!!

So, if you pull the fuse when the car is turned off, it stays quiet all the time? How would you make it stay open at all times?

Last edited by KBoltz; Jun 20, 2008 at 01:57 PM.
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Old Jun 20, 2008 | 02:07 PM
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Buy the M2W switch through nakidparts. On the highway the drone will get old.
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Old Jun 20, 2008 | 02:20 PM
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Originally Posted by Max EPR
I put the mild to wild on yesterday and love it. "Sometimes I feel like a nut and sometimes I don't." For short trips I love the sound and for highway driving I like it quiet. Life with a Corvette is really good.
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Old Jun 20, 2008 | 03:15 PM
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Pull the fuse, I just got my 08 with NPP, pulled the fuse and what a sound, with the fuse in there and it closed it sounds like a caddy, and i think i get better gas millage with the fuse pulled.
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Old Jun 20, 2008 | 03:26 PM
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Originally Posted by dpigguy
forget pulling the fuse - get one of Ed's M2W switches and you can have it both ways at a push of a button.


Originally Posted by KBoltz
$1195.00 according to the window sticker - gives me the option of quiet for cruising and loud when I get on it. I prefer the loud all the time. My C4 has the muffler eliminators and I have an x-pipe in lieu of the factory resonator. Gets loud on the highway at times, but that's what the stereo is for!!

So, if you pull the fuse when the car is turned off, it stays quiet all the time? How would you make it stay open at all times?
Pulling the fuse leaves the valves open all the time, not closed. Doesn't matter if you pull the fuse with the car off or on. With the fuse in, the valves open up when you shut the car off because they rely on the electrical system of the car to activate. Thus, when you pull the fuse, the system thinks the car is off and opens the valves.

Last edited by maw455; Jun 20, 2008 at 03:31 PM. Reason: More info.
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Old Jun 20, 2008 | 05:37 PM
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look familiar?
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Old Jun 20, 2008 | 05:43 PM
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How much louder is the car with valves open? Is there a sound clip somewhere to compare the two sounds?
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Old Jun 20, 2008 | 05:44 PM
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Originally Posted by KBoltz
$1195.00 according to the window sticker - gives me the option of quiet for cruising and loud when I get on it. I prefer the loud all the time. My C4 has the muffler eliminators and I have an x-pipe in lieu of the factory resonator. Gets loud on the highway at times, but that's what the stereo is for!!

So, if you pull the fuse when the car is turned off, it stays quiet all the time? How would you make it stay open at all times?
Thanks for the info
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Old Jun 20, 2008 | 05:45 PM
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Originally Posted by dpigguy
forget pulling the fuse - get one of Ed's M2W switches and you can have it both ways at a push of a button.


It is great to have the option readily available. You want louder exhaust? Then just push the little button. Done playing and want a quiet cruise once again? Then just press the other little button. It really doesn't get much more convenient.
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Old Jun 20, 2008 | 05:55 PM
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Originally Posted by F40
How much louder is the car with valves open? Is there a sound clip somewhere to compare the two sounds?
It's hard to quantify without hearing it for yourself, but here goes: Noticeably louder - actually, noticeably deeper. Not obnoxiously loud, though. Much more of a deep V8 rumble at idle, and you can really hear the V8 sound when you get on the gas.

The sound clips on-line really don't tell you too much. Supposedly, with the valves open it reduces backpressue by 70-80%, hence the louder, lower rumble. Plus, you also get the "burble" sound on deceleration.
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Old Jun 20, 2008 | 06:03 PM
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Originally Posted by F40
How much louder is the car with valves open? Is there a sound clip somewhere to compare the two sounds?
Here is a video I did with my still camera (so it's not great), will take time to load (I can not emphasize enough that you need to turn up the volume and you need a good speaker system (with bass) or a good set of headphones). I have the bose II on my PC and my cabinets shake in the wild mode.

Notice how the inner flaps open and close

Play Video (with headers)

Play Video (without headers)

Last edited by Pipedreams; Jun 20, 2008 at 06:06 PM.
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