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Old 02-21-2019, 11:46 AM   #15
VR Baron
SoCal Camaro5 Race Team
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Drives: 2012 VR 2SS RS M6
Join Date: Mar 2010
Location: SO CAL
Posts: 13,649
A guy tested the npp at full open at idle and 4000 rpm with a decibel reader as the ref station would. Read the max 95 dB. But that was in the garage where I suspect a echo could cause a louder reading. The chp uses 95 dB at 50 ft. I have what is in my sig. the 3” catback booms at low rpm, removed hiflow cats and put stock ones back in to be legal, and a little more quiet. Sounds good still and more liveable. Only lost 11 hp. To compare, with the hiflows on, at scca autocross events there is a 95 dB max and My car never hit that. They gave a meter set to make sure.
Now a cop hearing your car can be another thing. I felt best not to be noticed at all so not to get pulled over
Mods: Magnaflow 3" comp catback/Rotofab CAI/Apex Scoop/VMax T/B/ G.M. Blade Spoiler/SLP Splitter/ Forgestar cf10 wheels & Michelin Super Sport tires/JBA Shorty Headers/tune/ Ridetech coilovers/DSE swaybars /BMR cradle bushings, toe links and trailing arms/Stage 1 cam-439/420 RWHP/TQ
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Old 02-21-2019, 11:55 AM   #16
Drives: 2015 2SS 1LE
Join Date: Dec 2016
Location: Indianapolis
Posts: 103
"496WHP/451TQ": btr stg 4 cam with all the goodies, kooks 1-7/8" headers,k&n intake,vmaxx tb,mgw,rxt,bmr 1.5" drop springs,bmr poly cradle bushings,bmr toe rods,bmr trailing arms,bmr uca,bmr diff bushings
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