04-17-2021, 03:06 AM | #1 |
Drives: Camaro SS Join Date: Feb 2021
Location: Irvine
Posts: 6
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NPP Exhaust Upgrade
Live in Cali and tired of getting pulled over for my MBRP axle back exhaust. Looking to upgrade to one that uses the NPP. Any suggestions that are quiet with the valves closed but sounds great when the valves open? Will sell the MBRP when I buy the new setup. Thanks
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04-17-2021, 06:38 AM | #2 |
Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 4,973
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Trade it for a 2SS with NPP after putting your SS back to stock. It's the easiest way to get all the NPP features, but not the cheapest.
Alternately, you can go to aftermarket wiring/switches w/ a Borla NPP or similar. |
04-17-2021, 07:57 AM | #3 |
Drives: 2023 2SS Convertible Join Date: May 2009
Location: Metro Detroit
Posts: 1,057
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The problem isn't the exhaust, it is your foot!
-Geoff
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'12 2SS RS Convertible - Traded in.
'16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold! '23 2SS Convertible -Same as above except orange. |
04-17-2021, 08:57 AM | #4 |
Drives: 2020 LT1 M6 Join Date: Jan 2016
Location: South, the DEEP south
Posts: 1,114
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04-17-2021, 10:04 AM | #5 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,789
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Quote:
The difference is the Corsa has supposedly no Drone with valves open or closed and 12db quieter closed. The Flowmaster has very little drone closed and some drone open(with cat deletes). Not sure how much quieter it is closed but it's significant(my guess is 6-8db). These are the only 2 exhausts I know of that have a significant volume difference between open and closed. That being said I recently bought the Corsa and will eventually be selling the Flowmaster. Only because I have always wanted Corsa but the NPP version wasn't available when I bought the FM. Probably wasted money on this venture but oh well.
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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 |
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04-17-2021, 10:45 AM | #6 | |
Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,670
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Quote:
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22 2SS 1LE M6 Summit White - RF, Flexfuel, LT2 intake, 95mm tb, ATI udp, VT ramair, full 28 dragpack - 11.68@122
16 1SS M6 LT2 intake + boltons on DR 11.0@126+ (Sold) |
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04-20-2021, 09:32 PM | #7 |
Drives: Waiting on 2024 A10 ZL1 CE Join Date: May 2020
Location: CA
Posts: 35
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I'm running a BORLA ATAK Axleback no NPP on my 1SS in Los Angeles and Orange County area. Never been pulled over... I'm also Orange.
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04-21-2021, 06:38 AM | #8 |
Drives: 2021 LT1 6spd Join Date: Nov 2020
Location: Arlington, VA
Posts: 767
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My Corsa NPP is being installed tomorrow. I eagerly await the sound and fury.
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Current: 2021 LT1 Camaro, 6spd, Crush, Corsa NPP, GMPP CAI, Soler Performance Throttle controller
Previous: 1997 V6 Camaro, 5spd, Black |
04-22-2021, 07:43 PM | #9 |
Drives: 2021 LT1 6spd Join Date: Nov 2020
Location: Arlington, VA
Posts: 767
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The Corsa NPP is outstanding. Rather loud and thunderous - but quiet in stealth.
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Current: 2021 LT1 Camaro, 6spd, Crush, Corsa NPP, GMPP CAI, Soler Performance Throttle controller
Previous: 1997 V6 Camaro, 5spd, Black |
04-22-2021, 08:43 PM | #10 |
Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,670
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How does stealth volume compared to stealth on stock npp
__________________
22 2SS 1LE M6 Summit White - RF, Flexfuel, LT2 intake, 95mm tb, ATI udp, VT ramair, full 28 dragpack - 11.68@122
16 1SS M6 LT2 intake + boltons on DR 11.0@126+ (Sold) |
04-23-2021, 04:46 AM | #11 | |
Drives: 2021 LT1 6spd Join Date: Nov 2020
Location: Arlington, VA
Posts: 767
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So this is what corsa sent me a while back when I asked about the volume, I did forget to ask full details (is this axle back only, how it’s measured, etc)
Quote:
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Current: 2021 LT1 Camaro, 6spd, Crush, Corsa NPP, GMPP CAI, Soler Performance Throttle controller
Previous: 1997 V6 Camaro, 5spd, Black |
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04-23-2021, 08:21 AM | #12 | |
Drives: 2023 2SS Convertible Join Date: May 2009
Location: Metro Detroit
Posts: 1,057
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Quote:
-Geoff
__________________
'12 2SS RS Convertible - Traded in.
'16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold! '23 2SS Convertible -Same as above except orange. |
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04-23-2021, 08:52 AM | #13 | |
Drives: 2021 LT1 6spd Join Date: Nov 2020
Location: Arlington, VA
Posts: 767
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Quote:
Understood, I am unfamiliar with the specific procedures, but I can tell you it is louder all around and has the exact rumble+look I was hoping to achieve. Stealth mode still functions even. The cold start will awaken the dead in an underground garage - scared myself a little to be honest. Very satisfied customer of Corsa here.
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Current: 2021 LT1 Camaro, 6spd, Crush, Corsa NPP, GMPP CAI, Soler Performance Throttle controller
Previous: 1997 V6 Camaro, 5spd, Black |
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04-25-2021, 08:01 AM | #14 |
Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,670
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Does the corsa closed really seem louder than npp open?
Love the amount of difference in db but def can’t have the car that much louder when closed
__________________
22 2SS 1LE M6 Summit White - RF, Flexfuel, LT2 intake, 95mm tb, ATI udp, VT ramair, full 28 dragpack - 11.68@122
16 1SS M6 LT2 intake + boltons on DR 11.0@126+ (Sold) |
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