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Old Jun 8, 2017 | 07:41 PM
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Default Npp?

Si, I have read a lot in here, it's great for information.... but I still am unclear if I have npp or not..... it's a 2017 corvette stingray
I do have the control in the centeral display for stealth, sport and track etc... but when switching between them, I don't really hear too much difference, if at all.... I also pulled the fuse (41 or 42), and don't seem to hear a difference.... how can I definitely know whether I have it?
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Old Jun 8, 2017 | 08:06 PM
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Go to the rear of the car and look inside at the L & R outermost pipes.

If you see a valve/flap,you have it.
If you don't,you don't.

\db2
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Old Jun 8, 2017 | 10:47 PM
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Yes, the flaps are very apparent but a flashlight might help. You'll see them if they are there.
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Old Jun 8, 2017 | 10:59 PM
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Easiest thing is to look at the size of the exhaust tips...

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Old Jun 8, 2017 | 11:55 PM
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If still not sure, take a photo of your exhaust tips and post for us to help...
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Old Jun 9, 2017 | 04:17 PM
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Originally Posted by Bonesplus
Si, I have read a lot in here, it's great for information.... but I still am unclear if I have npp or not..... it's a 2017 corvette stingray
I do have the control in the centeral display for stealth, sport and track etc... but when switching between them, I don't really hear too much difference, if at all.... I also pulled the fuse (41 or 42), and don't seem to hear a difference.... how can I definitely know whether I have it?
from what you explained you Don't have NPP for sure.

Moving from eco/Touring to Sport/track is very very noticable.. the car gets louder at idle and WOT
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Old Jun 9, 2017 | 04:17 PM
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Originally Posted by dbaker
Go to the rear of the car and look inside at the L & R outermost pipes.

If you see a valve/flap,you have it.
If you don't,you don't.

\db2
Originally Posted by vbdenny
Yes, the flaps are very apparent but a flashlight might help. You'll see them if they are there.
Another way -- Just bend down and look at the short section of pipe connecting the muffler to the tips.
*If you see an actuator or *any* kind of 'gizmos' on the outer pipes, you've got NPP.
*If you see just plain pipe between the muffler and the tip-- no NPP.

Picture swiped from elsewhere:


Last edited by Kent1999; Jun 9, 2017 at 04:25 PM.
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Old Jun 9, 2017 | 08:57 PM
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Or look at your window sticker for the Performance Exhaust option or Z51 option. If you have neither, you don't have NPP.
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Or look in the back hatch area under the carpet on the right side. There is a list of option codes there.
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