gaurav

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.

HummelS

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.

Mdm23

I think NPP is just the order code for the bi-mode exhaust.

Quick Silver Z

http://forums.corvetteforum.com/1567276922-post5.html

http://forums.corvetteforum.com/1575854765-post9.html

Zymurgy

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).

BigJoe

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.

RedC7AZ

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.

robertbruce

Spend the money and get it. It will be too late when the car is built and you wish you had ordered it.

Larry/car

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.

sandu002

I would say if you don't want the NPP, then get a non Z51. The C7 is built as a performance car and if you don't want full performance the non Z51 models are your best buy.

AFVETTE

And don't forget there are great aftermarket and many claim better sounding exhaust systems out there.

So you do have more than just the factory system to choose from.

fredl11

here is a good vid!!

Motohead279

I'd have to disagree with that comment. I decided not to order the NPP because like you said the Z51 is a "performance car", and I don't want to pay extra for a switch to make it quiet. I ordered mine specifically without it because my plan was to add an aftermarket system, because I think they sound much better than stock.

I just wasn't expecting it taking 8 months for the aftermarket companies to get systems out.

wan65

If its ok to ask, what did you do to make the valve stay open all the time, I get mine in a week, and I like it loud also.

robertbruce

In the c6 you would remove the fuse for the npp. Don't know about the c7.

Diver Down

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.

BigJoe

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.

eboggs_jkvl

Set up option in personal settings. Turn it on/off and it stays that way.

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

BigJoe

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.

eboggs_jkvl

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