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Old 07-03-2013, 09:05 PM   #1
Bcmayo
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Default NPP exhaust option

Still looking to buy my first vette. Is there a way to tell if a c6 is equipped with the NPP exhaust option by VIN number?
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Old 07-03-2013, 09:15 PM   #2
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Not sure if you can tell by the VIN, but its easy to know when you are with the car
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Old 07-03-2013, 09:21 PM   #3
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I can't answer the VIN question, but you can also add NPP with an aftermarket kit and NPP style mufflers.
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Old 07-03-2013, 09:34 PM   #4
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Call your local Chevy dealer's parts department with the VIN and they can tell you. I hope this helps.
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Old 07-03-2013, 09:41 PM   #5
raspyc6
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just open the glove compartment and the option code NPP will be listed. A less intensive option would be to look for the venturi valve equipment out back
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Old 07-03-2013, 09:54 PM   #6
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Thanks!
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Old 07-03-2013, 10:12 PM   #7
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Quote:
Originally Posted by raspyc6 View Post
just open the glove compartment and the option code NPP will be listed. A less intensive option would be to look for the venturi valve equipment out back
Exactly. The VIN will tell you nothing about options. From 2010 on the VIN will tell you what base packages (1LT, 2LT, etc.), GS, Z06, and ZR1 packages. All other options can be found on the glove box decal or a build sheet/window sticker if you have one.

If your inner exhaust tips have the butterfly valve, the car has NPP. Whether it is factory optioned or owner added can only be told by the option sheet.
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Old 07-03-2013, 10:30 PM   #8
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Look from this angle or have them send a picture. I thought I had a closer one, but you can see the valves on the two inside pipes if you look close.


Edit: Found one:
Attached Images
 

Last edited by spdkilz911; 07-03-2013 at 10:32 PM.
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Old 07-03-2013, 10:45 PM   #9
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Quote:
Originally Posted by steveb601 View Post
I can't answer the VIN question, but you can also add NPP with an aftermarket kit and NPP style mufflers.
With such a small percent of used vettes with NPP it is much easier to add yourself. Bought a used set for $600 for mine, or their is more expensive aftermarket options.
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Old 07-04-2013, 08:39 AM   #10
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Where did you find them?
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Old 07-04-2013, 08:50 AM   #11
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Quote:
Originally Posted by Bcmayo View Post
Where did you find them?
They pop up in the For Sale section from time to time.
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Old 07-04-2013, 08:59 AM   #12
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I really like the NPP's
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Old 07-04-2013, 09:08 AM   #13
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Where did you find them?
I posted in the 'Wanted to buy" section and received a response and purchased as a result.
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Old 07-04-2013, 10:09 AM   #14
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Heck you can tell if a vette has NPP and the fuse pulled from a distance. Just look at the inside pipes. If they're blacker than the outside ones, the car has NPP and the fuse is pulled (or M2W, or a 2 dollar switch like I have).

This is the classic "I've got the fuse pulled" look:

Click the image to open in full size.
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Old 07-04-2013, 10:49 PM   #15
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New '13 GS owner with the NPP option. Asking the question: Is the valve operated by solenoid or vacuum? In reading a few threads, it sounds like there is a way to open the valve all the time vs just above 3K RPM with heavy foot. Simple fix? Pulling the fuse doesn't send a code to the ECU?

So I gotta ask: Is the non-NPP (standard) exhaust like the NPP option in quiet mode? Or full open mode? If the latter, why do dealers order the extra cost NPP option only to have new owners immediately disable it?
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Old 07-04-2013, 11:21 PM   #16
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NPP valves on the mufflers are controlled by vacuum. My car didn't come with it but i used the aftermarket ones from B&B and routed the hoses, etc. The B&B sound similar to normal exhaust when the valves are closed and louder when open. Some people disable them and keep them loud all the time...others prefer to be able to control them when they want. Also by using one of the aftermarket switches you can control it manually vs. hitting the RPMs, etc.
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Old 07-05-2013, 02:51 AM   #17
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NPP... the best option I never knew I wanted. Absolutely love mine, although I would very highly recommend either a mild to wild controller or some sort of a hardwired switch so that you have total control of the NPP baffles.

They are very easy to spot if you look at an exhaust from behind. The solenoids above the mufflers stick out like a sore thumb. Some people cover them although I personally like them.
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Old 07-05-2013, 07:02 AM   #18
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Quote:
Originally Posted by Bcmayo View Post
Still looking to buy my first vette. Is there a way to tell if a c6 is equipped with the NPP exhaust option by VIN number?
If buying used, as mentioned, simply bend down and look for the valve actuators on the pipe coming out from the mufflers. If new, it will be listed as an option on the window sticker. Also, the exhaust tips are slightly larger on the NPP vs the base non NPP exhaust.
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Old 07-05-2013, 03:51 PM   #19
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Quote:
Originally Posted by Stavesacre21 View Post
NPP... the best option I never knew I wanted. Absolutely love mine, although I would very highly recommend either a mild to wild controller or some sort of a hardwired switch so that you have total control of the NPP baffles.
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Old 07-05-2013, 03:53 PM   #20
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Quote:
Originally Posted by steveb601 View Post
NPP valves on the mufflers are controlled by vacuum. My car didn't come with it but i used the aftermarket ones from B&B and routed the hoses, etc. The B&B sound similar to normal exhaust when the valves are closed and louder when open. Some people disable them and keep them loud all the time...others prefer to be able to control them when they want. Also by using one of the aftermarket switches you can control it manually vs. hitting the RPMs, etc.
And I read that the C7 will use some sort of electronic acutator for the NPP.
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Old 07-05-2013, 03:53 PM
 
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