Just the RPO code....found my self using those letters to describe it though....does'nt help anyone just getting into Vettes...
What does the NPP stand for.
Burning Brakes
Joined: Aug 2018
Posts: 1,030
Likes: 219
From: Fredericksburg VA
I also do not know exactly what NPP includes or does not include. I would also like to know exactly how it is different from the engine exhaust ports to the back tips.
For example: is it only the butterfly values and controls on the rear? Or is it a stainless steel muffler, and pipes to the stainless manifold?
Are the hangers also stainless, or are they standard soft steel.
Don't let these people make you feel stupid or anything like that.
Its a very good question. I asked my salesman for my C7 what it meant, exactly, and he did not know also.
I would love it if someone who knows this stuff responds with something actually thought-out a bit rather than give non-response responses.
How about it? Can someone tell us what this means in terms of having or not having this option. I have it on my 2014 C7 and on my 2019 C7 and I still do not know exactly what the difference is beyond the butterfly valves and control system.
Who can actually help us?
For example: is it only the butterfly values and controls on the rear? Or is it a stainless steel muffler, and pipes to the stainless manifold?
Are the hangers also stainless, or are they standard soft steel.
Don't let these people make you feel stupid or anything like that.
Its a very good question. I asked my salesman for my C7 what it meant, exactly, and he did not know also.
I would love it if someone who knows this stuff responds with something actually thought-out a bit rather than give non-response responses.
How about it? Can someone tell us what this means in terms of having or not having this option. I have it on my 2014 C7 and on my 2019 C7 and I still do not know exactly what the difference is beyond the butterfly valves and control system.
Who can actually help us?
The NPP exhaust is basically an axle back upgrade that includes the mufflers with a baffle that can be opened and closed, apparently on the inside exhaust pipes. It can be added to a stock corvette and like the guy in this video a vacuum line was run and he installed a switch in the console to turn them on or off.
Last edited by SPSandman; Jan 23, 2019 at 01:41 PM.
Team Owner
Joined: May 2004
Posts: 82,175
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From: McKinney TX
St. Jude Donor '21-'22-'23-'24
Safety Car
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From: Etobicoke (Toronto) Ontario
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Melting Slicks
Joined: Jun 2013
Posts: 2,313
Likes: 251
From: Baltimore Maryland
Not sure what NPP stands for, but I now notice adjustable exhausts like our NPP are available on tons of cars now . . . our Audi SUV even has it. Just wondering - was the Corvette the first car to offer this technology ?
I also see other things like heads-up-displays and magnetic ride suspensions all over; prettty sure they were developed by GM in the Corvette first.
I also see other things like heads-up-displays and magnetic ride suspensions all over; prettty sure they were developed by GM in the Corvette first.
Pro
Joined: May 2014
Posts: 609
Likes: 103
From: Ohio
Not sure what NPP stands for, but I now notice adjustable exhausts like our NPP are available on tons of cars now . . . our Audi SUV even has it. Just wondering - was the Corvette the first car to offer this technology ?
I also see other things like heads-up-displays and magnetic ride suspensions all over; prettty sure they were developed by GM in the Corvette first.
I also see other things like heads-up-displays and magnetic ride suspensions all over; prettty sure they were developed by GM in the Corvette first.
Burning Brakes
Joined: Aug 2018
Posts: 1,030
Likes: 219
From: Fredericksburg VA
Yup. The Delphi Corporation Developed it for GM and the first vehicle that had it was the 2002 Cadillac Seville STS.
Instructor
Joined: Jan 2022
Posts: 121
Likes: 24
From: Simi Valley,Ca
I have seen pictures of a C8 exhaust manifold that said they are cast stainless and not made from tubes like the NPP manifolds. If that is correct the manifolds are different.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I understand it to be Regular Production Order, since several of those codes are on every Corvette and many of the codes are on other GM cars.
AJ7 is airbags, CJ2 is Dual Zone AC, U52 is Electronic Instrumentation, FE9 is Federal Emissions, BGR is Bowling Green Plant
AJ7 is airbags, CJ2 is Dual Zone AC, U52 is Electronic Instrumentation, FE9 is Federal Emissions, BGR is Bowling Green Plant
Team Owner
Joined: May 2004
Posts: 82,175
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From: McKinney TX
St. Jude Donor '21-'22-'23-'24
