Npp?
Thread Starter
Intermediate
Joined: Apr 2014
Posts: 36
Likes: 0
From: Dubai Dubai
Npp?
I'm sorry for my ignorance and lack of knowledge. As this will be the first ever corvette that I will own. I would like to know what NPP stands for and what it does. Tried looking on google with no outcome. Thanks in advance to all the tech geniuses for their replies.
Race Director
Joined: Aug 1999
Posts: 17,541
Likes: 2
From: Manhattan, KS Missing SoCal since 2005
I like the standard exhaust just fine - it's certainly not worth it to me to spend over a thousand bucks just to make more noise.
Team Owner
Joined: Mar 2007
Posts: 35,183
Likes: 2,125
From: Right Corner Pocket of Illinois
No-IL Events Coordinator
2026 Corvette of the Year Finalist - Unmodified
2025 C6 of the Year Winner - Unmodified
2020 C6 of the Year Finalist - Unmodified
2020 Corvette of the Year Finalist (appearance mods)
2019 C6 of Year Winner (appearance mods)
2018 C6 of Year Finalist
St. Jude Donor '12 thru '26
http://forums.corvetteforum.com/1567276922-post5.html
http://forums.corvetteforum.com/1575854765-post9.html
http://forums.corvetteforum.com/1575854765-post9.html
Last edited by Quick Silver Z; Apr 26, 2014 at 09:34 PM.
Moderator
Joined: Feb 2006
Posts: 39,129
Likes: 17,978
From: DFW Area TX
From the Online Order/Reference Guide:
Also increase torque to 465 lb-ft.
To me, the stock exhaust is way too quiet for a "performance" car. I have my NPP set so the valves are always open (the louder setting).
NPP Exhaust, performance, increases to 460 horsepower, aggressive exhaust sound, with 4" polished stainless-steel tips
To me, the stock exhaust is way too quiet for a "performance" car. I have my NPP set so the valves are always open (the louder setting).
Race Director
Joined: Jun 2000
Posts: 13,733
Likes: 66
From: Hurst, TX USA
The letters NPP are not an acronym, it doesn't "mean" anything. It is just a GM code for a switchable, variable exhaust system. You can control how loud or soft the sound if from inside the car. Pretty handy. I leave for work early, so I turn it down so I don't wake the neighborhood when I leave. And turn it up when I get on the highway to hear that big V8. 
Race Director
Joined: May 2006
Posts: 16,854
Likes: 535
The Performance Exhaust adds exactly 5 HP and 5 TQ, but that is not the primary reason to get it.
It was certainly worth spending a hair over $1,000 for the awesome sounding exhaust. The performance exhaust makes the car sound like it looks. ...and you can turn off the feature if you want. I'm not sure why you ever would, unless you don't want to wake your neighbors if you get home real late.
Performance Exhaust should help resale values as it is one of, if not THE most popular option, with about an 80% take rate. So it should continue to be in-demand when resale time comes.
The wider tailpipe tips look cool too.
It was certainly worth spending a hair over $1,000 for the awesome sounding exhaust. The performance exhaust makes the car sound like it looks. ...and you can turn off the feature if you want. I'm not sure why you ever would, unless you don't want to wake your neighbors if you get home real late.
Performance Exhaust should help resale values as it is one of, if not THE most popular option, with about an 80% take rate. So it should continue to be in-demand when resale time comes.
The wider tailpipe tips look cool too.
Last edited by RedC7AZ; Apr 27, 2014 at 01:20 AM.
Le Mans Master
Joined: Jul 2013
Posts: 5,191
Likes: 3,388
From: Morrill Nebraska
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
I don't know what the initials stand for, but this exhaust has butterfly valves that enable some of the exhaust to bypass the mufflers, increasing the sound level, and maybe adding a few horsepower.
I like the standard exhaust just fine - it's certainly not worth it to me to spend over a thousand bucks just to make more noise.
I like the standard exhaust just fine - it's certainly not worth it to me to spend over a thousand bucks just to make more noise.
I have not really pulled enough power to comment on the standard exhaust sound. Still playing with the electronics and there is a limit on RPM/power for the first 500 miles. Currently, 100 miles and four days since purchase.
Drifting
Joined: Sep 2013
Posts: 1,906
Likes: 51
From: Tampa Florida
I just wasn't expecting it taking 8 months for the aftermarket companies to get systems out.
Racer
Joined: Mar 2014
Posts: 297
Likes: 3
From: Kingwood Tx
From the Online Order/Reference Guide:
Also increase torque to 465 lb-ft.
To me, the stock exhaust is way too quiet for a "performance" car. I have my NPP set so the valves are always open (the louder setting).
Also increase torque to 465 lb-ft.
To me, the stock exhaust is way too quiet for a "performance" car. I have my NPP set so the valves are always open (the louder setting).
Le Mans Master
Joined: Jul 2013
Posts: 5,191
Likes: 3,388
From: Morrill Nebraska
Burning Brakes
Joined: Feb 2014
Posts: 780
Likes: 4
From the Online Order/Reference Guide:
Also increase torque to 465 lb-ft.
To me, the stock exhaust is way too quiet for a "performance" car. I have my NPP set so the valves are always open (the louder setting).
Also increase torque to 465 lb-ft.
To me, the stock exhaust is way too quiet for a "performance" car. I have my NPP set so the valves are always open (the louder setting).
I agree. I have NPP and in Touring mode it's pretty tame but in sport mode the depth and dimension of the sound really supports the exotic looks of the car.
It looks fast. It sounds fast. It is fast.
Race Director
Joined: Jun 2000
Posts: 13,733
Likes: 66
From: Hurst, TX USA
There is nothing that will make it loud all the time. (Short of pulling fuses/wiring the valves open etc. - no one is sure that even works.) There is a setting that will make it loud under acceleration in 4 drive settings (not sure about Weather), but when cruising at a constant speed the exhaust always goes quiet (but I haven't tried that in Track yet). I thought it does that was only when it went to 4 cylinder mode, but that is apparently not the case.
Last edited by BigJoe; Apr 27, 2014 at 11:32 AM.
Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,954
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Page 5-42
Driving Mode
Select and the following may be displayed:
. Engine Sound Management
. Steering
. Suspension
Engine Sound Management
This allows the Engine Sound Management feature to be turned on or off.
Select Auto (Mode Selector) or Off.
Steering
This allows the Steering feature to be turned on or off.
Select Auto (Mode Selector), Tour, Sport, or Track.
Suspension
This allows the Suspension feature to be turned on or off.
Select Auto (Mode Selector), Tour, Sport, or Track.
Elmer
Race Director
Joined: Jun 2000
Posts: 13,733
Likes: 66
From: Hurst, TX USA
Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,954
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Thanks for the manual quote. But, as usual, it doesn't tell the whole story. As I said above those ESM settings only work when you are accelerating. Constant speed cruising is always quiet. The question was how to make it loud ALL the time. AFAIK no one has figured that out yet.
Thanks for that. I guess a little epoxy and bailing wire on the valves will be in order huh?
I figured it'd be too easy via the dash. Is it dropping out of "loud" when it switches to 4 cylinders?
Elmer