Borla S-type with NPP

SienarSystems · 10-14-2018, 12:54 PM

Does anyone know the decibel range for the exhaust? I’d like to be able to track my car and the maximum sound output allowed on Sonoma Raceway is 96 decibels - the raceway notes the stock GT350 and a couple of Porsches exceed the max stock.

If any other aftermarket exhaust decibel ranges are known those would be appreciated too - the AWE looks like a great choice except for the lack of NPP.

Thanks in advance!

Gunkk · 10-14-2018, 01:08 PM

Pretty much everything aftermarket will fail a 96dB limit as will stock exhaust if not in Stealth mode. Spend some of your $ to integrate something like this GPS valve controller.

Forza (not sure if GPS enabled):
https://www.camaro6.com/forums/showthread.php?t=514684

Alekshop (for Porsche but can probably be retrofit):
https://speeddistrict.com/product/al...ve-controller/

SienarSystems · 10-14-2018, 01:45 PM

Thanks for the links Gunkk...guess it’s no surprise the Porsches listed on the speeddistrict site are the ones that fail the noise restrictions at Sonoma.

10-14-2018, 12:54 PM	#1
SienarSystems Drives: ZL1 1LE Join Date: Oct 2018 Location: NYC (almost) Posts: 339	Borla S-type with NPP Does anyone know the decibel range for the exhaust? I’d like to be able to track my car and the maximum sound output allowed on Sonoma Raceway is 96 decibels - the raceway notes the stock GT350 and a couple of Porsches exceed the max stock. If any other aftermarket exhaust decibel ranges are known those would be appreciated too - the AWE looks like a great choice except for the lack of NPP. Thanks in advance! Last edited by SienarSystems; 10-14-2018 at 07:43 PM.

10-14-2018, 01:08 PM	#2
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,973 View My Garage	Pretty much everything aftermarket will fail a 96dB limit as will stock exhaust if not in Stealth mode. Spend some of your $ to integrate something like this GPS valve controller. Forza (not sure if GPS enabled): https://www.camaro6.com/forums/showthread.php?t=514684 Alekshop (for Porsche but can probably be retrofit): https://speeddistrict.com/product/al...ve-controller/

10-14-2018, 01:45 PM	#3
SienarSystems Drives: ZL1 1LE Join Date: Oct 2018 Location: NYC (almost) Posts: 339	Thanks for the links Gunkk...guess it’s no surprise the Porsches listed on the speeddistrict site are the ones that fail the noise restrictions at Sonoma.

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