Exhaust Sound Levels

1LE_Blue · 02-12-2022, 08:31 AM

Hello,

I’m getting Kooks Headers and Corse Extreme installed. I can spend the extra $700 for the NPP sound control but I really don’t want to. Here’s my issue…I would like to track this car but I know that most tracks have sound decibel requirements. This is my dilemma. Get the NPP to be safe and have as a back up if my 1LE is too loud in track mode? I would never use it otherwise. Please help!

Spaceme1117 · 02-12-2022, 08:44 AM

Definitely get the NPP.

Vigilante375 · 02-12-2022, 10:35 AM

I know you're not supposed to run the car at full throttle with the exhaust in quiet mode with the stock NPP setup. The car actually opens the exhaust valve even if you have it on stealth mode to track mode when you go full throttle.

So I would assume aftermarket exhausts with the NPP would follow the same guide lines to not damage the exhaust system.

I would contact Corsa and ask them any damage can occur from racing while the exhaust is in stealth mode.

JSH · 02-12-2022, 10:54 AM

Kooks LT, green cats, AB, no NPP, here, but our road course does not have db limts

arpad_m · 02-12-2022, 12:27 PM

Quote:

Originally Posted by Vigilante375

I know you're not supposed to run the car at full throttle with the exhaust in quiet mode with the stock NPP setup. The car actually opens the exhaust valve even if you have it on stealth mode to track mode when you go full throttle.

So I would assume aftermarket exhausts with the NPP would follow the same guide lines to not damage the exhaust system.

I would contact Corsa and ask them any damage can occur from racing while the exhaust is in stealth mode.

A few years ago a member posted this with a comment along the lines of "why not to use stealth mode on the track"... the tips are aftermarket, but the exhaust behind them looks stock.

The valves do open the exhaust at 100% throttle in stealth if I remember correctly, but it seems there is still potential for damage, because nobody is at WOT all the time even on a track.

Vigilante375 · 02-12-2022, 12:57 PM

Quote:

Originally Posted by arpad_m

A few years ago a member posted this with a comment along the lines of "why not to use stealth mode on the track"... the tips are aftermarket, but the exhaust behind them looks stock.

The valves do open the exhaust at 100% throttle in stealth if I remember correctly, but it seems there is still potential for damage, because nobody is at WOT all the time even on a track.

I believe the manual states that if you're racing to not leave the exhaust in stealth or tour.

Edit: it's on page 14 under driving and operating: track events and competitive driving.

zxspeedspec · 02-12-2022, 02:00 PM

If passing sound is your concern you can fab some Laguna pipes.

Timbo-1LE · 02-12-2022, 02:38 PM

I have kooks and high flow cats into the stock and it's loud at full throttle..

I cannot imagine a cat back on top of it.

1LE_Blue · 02-12-2022, 03:13 PM

Quote:

Originally Posted by Spaceme1117

Definitely get the NPP.

Appreciate it.

1LE_Blue · 02-12-2022, 03:14 PM

Quote:

Originally Posted by Vigilante375

I know you're not supposed to run the car at full throttle with the exhaust in quiet mode with the stock NPP setup. The car actually opens the exhaust valve even if you have it on stealth mode to track mode when you go full throttle.

So I would assume aftermarket exhausts with the NPP would follow the same guide lines to not damage the exhaust system.

I would contact Corsa and ask them any damage can occur from racing while the exhaust is in stealth mode.

Good insight. Appreciate the info.

1LE_Blue · 02-12-2022, 03:16 PM

Quote:

Originally Posted by zxspeedspec

If passing sound is your concern you can fab some Laguna pipes.

I’ll need to learn more about this. Thanks for the info.

UnknownJinX · 02-12-2022, 04:36 PM

Just saying, there are also factors like how lenient the tracks are with the sound limit. Some are definitely stricter than others from what I understand. The lenient ones usually will let you get away with a loud-ish exhaust as long as it's not straight-pipe loud.

1LE_Blue · 02-12-2022, 06:49 PM

Quote:

Originally Posted by UnknownJinX

Just saying, there are also factors like how lenient the tracks are with the sound limit. Some are definitely stricter than others from what I understand. The lenient ones usually will let you get away with a loud-ish exhaust as long as it's not straight-pipe loud.

Good to know. Appreciate it.

1LE_Blue · 02-12-2022, 06:54 PM

Quote:

Originally Posted by JSH

Kooks LT, green cats, AB, no NPP, here, but our road course does not have db limts

That’s what I would prefer…a track with no db limits. Can you tell me what track and location?

02-12-2022, 08:31 AM	#1
1LE_Blue Drives: Chevy Camaro ZL1 1LE Join Date: Sep 2021 Location: Indiana Posts: 36	Exhaust Sound Levels Hello, I’m getting Kooks Headers and Corse Extreme installed. I can spend the extra $700 for the NPP sound control but I really don’t want to. Here’s my issue…I would like to track this car but I know that most tracks have sound decibel requirements. This is my dilemma. Get the NPP to be safe and have as a back up if my 1LE is too loud in track mode? I would never use it otherwise. Please help!

02-12-2022, 10:54 AM	#4
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,560	Kooks LT, green cats, AB, no NPP, here, but our road course does not have db limts __________________ '20 ZL1 1LE A10, OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.

02-12-2022, 04:36 PM	#12
UnknownJinX Drives: 19 Chevrolet Camaro 2SS 1LE Shock Join Date: Apr 2020 Location: BC, Canada Posts: 1,947	Just saying, there are also factors like how lenient the tracks are with the sound limit. Some are definitely stricter than others from what I understand. The lenient ones usually will let you get away with a loud-ish exhaust as long as it's not straight-pipe loud. __________________ Current: 2019 Chevrolet Camaro 2SS 1LE M6 Shock GM Performance Intake and that's it, because driver mods before car mods Past: 2009 Mazda RX-8 GT M6 Velocity Red Mica (Sold) 2015 Chevrolet Corvette Z51 2LT M7 Velocity Yellow Tintcoat (Flood totaled)

02-12-2022, 08:44 AM	#2
Spaceme1117 Drives: 2017 Camaro SS, 2011 Corvette GS Join Date: Feb 2019 Location: Erlanger, Kentucky 41018 Posts: 815	Definitely get the NPP.

02-12-2022, 10:35 AM	#3
Vigilante375 Drives: 2018 Camaro ZL1 Join Date: Aug 2018 Location: Georgia Posts: 1,370	I know you're not supposed to run the car at full throttle with the exhaust in quiet mode with the stock NPP setup. The car actually opens the exhaust valve even if you have it on stealth mode to track mode when you go full throttle. So I would assume aftermarket exhausts with the NPP would follow the same guide lines to not damage the exhaust system. I would contact Corsa and ask them any damage can occur from racing while the exhaust is in stealth mode.

02-12-2022, 02:00 PM	#7
zxspeedspec Banned Drives: Faster than yours Join Date: Nov 2021 Location: Earth Posts: 288	If passing sound is your concern you can fab some Laguna pipes.

02-12-2022, 02:38 PM	#8
Timbo-1LE Drives: 2017 SS 1LE Join Date: Mar 2017 Location: Florida Posts: 617	I have kooks and high flow cats into the stock and it's loud at full throttle.. I cannot imagine a cat back on top of it.

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