NPP vs non-NPP
Race Director
Joined: May 2006
Posts: 16,854
Likes: 535
Can't comment on comparison to no NPP, but when NPP is operating it sounds much deeper and throatier than when the system is off.
It really helps the car sound more like it looks.
I have it set to be on all the time, and love sound when the car starts up.
Can't think of anything else either on the car or elsewhere where my $1,100 could have been better spent.
It really helps the car sound more like it looks.
I have it set to be on all the time, and love sound when the car starts up.
Can't think of anything else either on the car or elsewhere where my $1,100 could have been better spent.
Last edited by RedC7AZ; May 11, 2014 at 02:46 PM.
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
choosing was slim. So I bought the NPP from a member off his new car. Then bought the actuators from GM.
I've been running mine open so I can't say about the sound closed
compared. But the standard is a huge choke and the NPP breathes
much better. Since I have 615 rwhp I need the NPP.
A&A swapped it for me and commented on the difference.
I would say that closed it would be comparably quiet to the non NPP
which is too quiet!
Race Director
Joined: Aug 1999
Posts: 13,300
Likes: 2,510
From: Bluffton SC via Canton Oh
Here's some basic recording I did with the stock exhaust.
http://forums.corvetteforum.com/c7-g...ound-clip.html
And here is what I switched out to and another 26 HP.
http://forums.corvetteforum.com/c7-t...sa-teaser.html
http://forums.corvetteforum.com/c7-g...ound-clip.html
And here is what I switched out to and another 26 HP.
http://forums.corvetteforum.com/c7-t...sa-teaser.html
Last edited by Greg00Coupe; May 11, 2014 at 09:26 PM.
Racer
Joined: Nov 2013
Posts: 271
Likes: 5
Just to be clear, when you guys say you are running them open all the time what do you mean by that? Sport mode/Track mode or some other way to disable the valves? I do not have my C7 yet but it's going to have the NPP exhaust. Thanks
Edited because I found out that you can select for all modes.
Edited because I found out that you can select for all modes.
Last edited by fun2fly; May 12, 2014 at 05:59 PM. Reason: found answer.
Instructor
Joined: Jan 2013
Posts: 105
Likes: 0
From: Twentynine Palms CA
If you are buying from "The Aftermarket" do you think it will cost less, look better and install correctly? This was engineered for the car, not just tube bent to fit. Weigh all the options including total cost.
Le Mans Master
Joined: Oct 2004
Posts: 8,615
Likes: 60
From: Haymarket Virginia
I purchased the NPP because here in the Commonwealth of Virginia the State Boyz as well as small local towns love to nail people for "Modified Exhaust." With the NPP I can add Longtubes and if I get pulled over I can show the cop it's stock mufflers and I can make them quiet if need be.
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Thread Starter
Team Owner
Joined: Sep 1999
Posts: 20,054
Likes: 44
From: Swansea IL
Thanks for all the replies.
I ordered my car with the NPP just for the looks of the tips. I really didn't like how my 07 Z06 sounded with the Bi-Mode exhaust it had, too "raspy at WOT". Maybe GM redesigned the C7 system and I'll like/use them more.
Cheers
I ordered my car with the NPP just for the looks of the tips. I really didn't like how my 07 Z06 sounded with the Bi-Mode exhaust it had, too "raspy at WOT". Maybe GM redesigned the C7 system and I'll like/use them more.
Cheers
Le Mans Master
Joined: Oct 2004
Posts: 8,615
Likes: 60
From: Haymarket Virginia
Thread Starter
Team Owner
Joined: Sep 1999
Posts: 20,054
Likes: 44
From: Swansea IL
Le Mans Master
Joined: Sep 2012
Posts: 8,793
Likes: 145
C6 with Corsa extreme catback is just barely loud enough for me; I would not want it any quieter. Cost is very comparable to NPP. Would I be happy with the NPP in open mode or would I still be looking to go aftermarket, do you think? I'd never use a quiet mode so that is not a factor.