Non-NPP vs. Stealth mode?

silstream · 09-09-2017, 09:35 AM

I haven't purchased yet and as much as I want a loud exhaust, I leave home early in the mornings and so to avoid waking kids in the roof above the garage and disturbing neighbors wanted to check if Stealth mode with NPP is quieter starting up than non-NPP?

Appreciate the irony but I'm almost more interested in NPP to have the option to make it quieter (will love it loud once I'm out on the road)!

cheers,
Pete.

Fraxum · 09-09-2017, 10:06 AM

Yes, I have LTs going through the NPP suitcase. On the street I am in full time stealth mode and the start up is not too bad. In any standard setting the LT start up wakes the dead. Fun at the track, but not at home.

Without LTs the startup is still loud in any setting as I remember.

SuperSound · 09-09-2017, 04:40 PM

NPP stealth is definitely quieter than a stock SS exhaust from my experience.

silstream · 09-10-2017, 12:24 AM

Many thanks - looks like NPP (either factory or equivalent aftermarket) will be required with the stock exhaust not being stealthy enough when I need it to be...

KingLT1 · 09-10-2017, 12:29 AM

Npp stealth makes it hard to even tell it's a V8 under the hood.

avalonandl · 09-10-2017, 10:22 AM

My experience is NPP is loud when first started no matter what mode. However I have not tried stealth.

crankaholic · 09-10-2017, 10:31 AM

Quote:

Originally Posted by avalonandl

My experience is NPP is loud when first started no matter what mode. However I have not tried stealth.

Stealth is the only mode that keeps the valves closed at startup. You're right, all other modes leave them open. You do have to go into stealth mode before turning the car off, I haven't found a way to change modes after the car has been turned off... that's annoying to be honest.

Megahurtz · 09-10-2017, 01:15 PM

Quote:

Originally Posted by crankaholic

Stealth is the only mode that keeps the valves closed at startup. You're right, all other modes leave them open. You do have to go into stealth mode before turning the car off, I haven't found a way to change modes after the car has been turned off... that's annoying to be honest.

Hold the start button for 5 seconds without putting your foot on the brake. The car will not start but all the electronics will turn on. You can then navigate into the Engine Sound Management and put it on Stealth. Then just put foot on brake and press start again to start the car in stealth mode.

crankaholic · 09-10-2017, 01:52 PM

Quote:

Originally Posted by Megahurtz

Hold the start button for 5 seconds without putting your foot on the brake. The car will not start but all the electronics will turn on. You can then navigate into the Engine Sound Management and put it on Stealth. Then just put foot on brake and press start again to start the car in stealth mode.

I should really read the manual, huh...

SuperSound · 09-10-2017, 01:54 PM

Quote:

Originally Posted by crankaholic

I should really read the manual, huh...

Don't think it's in there. Service mode might be but not the trick to getting a stealth startup.

Sent from my SM-G950U using Tapatalk

AdmAnt13 · 09-10-2017, 01:56 PM

Quote:

Originally Posted by Megahurtz

Hold the start button for 5 seconds without putting your foot on the brake. The car will not start but all the electronics will turn on. You can then navigate into the Engine Sound Management and put it on Stealth. Then just put foot on brake and press start again to start the car in stealth mode.

Thats insanely helpful. Thank you

DarkSSide · 06-12-2018, 07:34 AM

I just did a quick search to reread this as I certainly don’t recall seeing it in the owners manual.....great info for a pre-6am ride out of my neighborhood this morning....thanks again Megahurtz!

KingLT1 · 06-12-2018, 08:05 AM

All you have to do is turn the ignition on(press start with foot off the brake) and set the drive mode to snow/ice and it sets the exhaust to stealth mode.

Lemosine · 06-12-2018, 09:40 AM

When in stealth the car still opens valves when you shut it down right? I know my car when in stealth mode when I shut it off the valves open up. But when I start it up it sorta starts loud then valves close, after about 1 second.

09-09-2017, 09:35 AM	#1
silstream Drives: 2022 SS 1LE Join Date: Aug 2017 Location: Seattle, WA Posts: 95	Non-NPP vs. Stealth mode? I haven't purchased yet and as much as I want a loud exhaust, I leave home early in the mornings and so to avoid waking kids in the roof above the garage and disturbing neighbors wanted to check if Stealth mode with NPP is quieter starting up than non-NPP? Appreciate the irony but I'm almost more interested in NPP to have the option to make it quieter (will love it loud once I'm out on the road)! cheers, Pete.

09-09-2017, 10:06 AM	#2
Fraxum Drives: a M6 LT1 ordered From Becky!!! Join Date: Jan 2010 Location: NJ Posts: 7,520	Yes, I have LTs going through the NPP suitcase. On the street I am in full time stealth mode and the start up is not too bad. In any standard setting the LT start up wakes the dead. Fun at the track, but not at home. Without LTs the startup is still loud in any setting as I remember. __________________ "Democracy Dies in Darkness" My LT1 Keeper ..... ..... My Car Blog CarPlayList, a free App to build USB and Android Music drives.

09-09-2017, 04:40 PM	#3
SuperSound Drives: '17 Camaro 2SS A8 Join Date: Jan 2015 Location: Eastern NC Posts: 5,063 View My Garage	NPP stealth is definitely quieter than a stock SS exhaust from my experience. __________________ Current: '17 2SS Hyper Blue, A8, MRC, NPP Past: '99 SS Camaro A4, '73 Camaro 383 A3 "Voices in your head are not considered insider information." 3800 Status - 6/16/16 (Built!) 6000 status - 6/29/16 (Delivered!)

09-10-2017, 12:29 AM	#5
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	Npp stealth makes it hard to even tell it's a V8 under the hood. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

09-10-2017, 10:22 AM	#6
avalonandl Drives: 2019 ZL-1 Join Date: Feb 2009 Location: Troy, MI & Naples, FL Posts: 2,019	My experience is NPP is loud when first started no matter what mode. However I have not tried stealth. __________________ 2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles... 2012 Yukon XL Denali w/ 6.2 AWD

09-10-2017, 12:24 AM	#4
silstream Drives: 2022 SS 1LE Join Date: Aug 2017 Location: Seattle, WA Posts: 95	Many thanks - looks like NPP (either factory or equivalent aftermarket) will be required with the stock exhaust not being stealthy enough when I need it to be...

06-12-2018, 07:34 AM	#12
DarkSSide Drives: 2017 2SS Camaro Convertible Join Date: May 2018 Location: Sacramento, CA Posts: 29	I just did a quick search to reread this as I certainly don’t recall seeing it in the owners manual.....great info for a pre-6am ride out of my neighborhood this morning....thanks again Megahurtz!

06-12-2018, 08:05 AM	#13
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	All you have to do is turn the ignition on(press start with foot off the brake) and set the drive mode to snow/ice and it sets the exhaust to stealth mode. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

06-12-2018, 09:40 AM	#14
Lemosine Drives: 2016 M6 Hyper Blue 2SS Join Date: May 2016 Location: Texas Posts: 221	When in stealth the car still opens valves when you shut it down right? I know my car when in stealth mode when I shut it off the valves open up. But when I start it up it sorta starts loud then valves close, after about 1 second. __________________ 16 2SS M6 // Kooks 1- 7/8 w/Off Road Pipes // RotoFab w/Oiled filter // Custom Axle Back Exhaust // E-85 Sensor // Tuned SOLD!!

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