09-09-2017, 09:35 AM | #1 |
Drives: 2022 SS 1LE Join Date: Aug 2017
Location: Seattle, WA
Posts: 95
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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 |
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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.
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"Democracy Dies in Darkness" |
09-09-2017, 04:40 PM | #3 |
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NPP stealth is definitely quieter than a stock SS exhaust from my experience.
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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, 12:24 AM | #4 |
Drives: 2022 SS 1LE Join Date: Aug 2017
Location: Seattle, WA
Posts: 95
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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...
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09-10-2017, 12:29 AM | #5 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,799
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Npp stealth makes it hard to even tell it's a V8 under the hood.
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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 |
Drives: 2019 ZL-1 Join Date: Feb 2009
Location: Troy, MI & Naples, FL
Posts: 2,019
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My experience is NPP is loud when first started no matter what mode. However I have not tried stealth.
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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...
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09-10-2017, 10:31 AM | #7 |
Drives: 2016 Camaro 2SS Join Date: Dec 2015
Location: Philadelphia
Posts: 771
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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.
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09-10-2017, 01:15 PM | #8 | |
Snackbar Tuning
Drives: 2023 SGM ZL1 Join Date: Oct 2016
Location: Florida
Posts: 1,111
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Quote:
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09-10-2017, 01:52 PM | #9 | |
Drives: 2016 Camaro 2SS Join Date: Dec 2015
Location: Philadelphia
Posts: 771
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Quote:
I should really read the manual, huh...
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09-10-2017, 01:54 PM | #10 |
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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
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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, 01:56 PM | #11 | |
Drives: '16 Red Hot 2SS M6 NPP Join Date: Apr 2016
Location: The Beach, NC
Posts: 603
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Quote:
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'16 2SS, M6, Borla Atak |
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06-12-2018, 07:34 AM | #12 |
Drives: 2017 2SS Camaro Convertible Join Date: May 2018
Location: Sacramento, CA
Posts: 29
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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!
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06-12-2018, 08:05 AM | #13 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,799
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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.
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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 |
Drives: 2016 M6 Hyper Blue 2SS Join Date: May 2016
Location: Texas
Posts: 221
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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.
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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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