Watch Out For Alhambra PD
05-11-12, 01:57 AM
#32
Not sure, I never tried it on my car since I have one of the quietest exhaust out there (Fujitsubo RM01-A), but I tried it at a bar before when everyone was screaming and I was picking up 100+ dB. And, I assure you, the screaming was definitely louder than my car at WOT 
i know you are suppose to be a certain distance away from the car though to accurately measure it Cali standards
does any1 know this number? it'd be nice to know if your car passes specs.
and on the other hand how does the officer know you arent revving at low rpms? cant you just do that to pass the decibel test?
Last edited by 1sWt2GS; 05-11-12 at 02:02 AM.
05-11-12, 02:01 AM
#33
upon further research 
quoted from bimmerwerkz.com
The process goes like this: The testing is done outdoors in a parking lot, with a decibel meter placed at a set distance away from the exhaust tip. (For you trivia nuts, the sound meter is placed 20 inches away from the source, at a 45-degree angle from the source, and 8 inches off the ground.) With the vehicle stationary, the engine is revved to a speed that represents three-quarters of maximum horsepower output (4,500 rpm for the Subaru), and a sound reading is taken.
A total of three readings are taken during the test, and the car must pass all three readings for it to be considered compliant. If it fails just one of the readings, it has failed the test and must be repaired before being re-inspected.
The California law set 95 decibels as the legal noise limit, and the test procedure allowed an error factor of plus or minus 1.5 decibels to account for ambient noise.
A total of three readings are taken during the test, and the car must pass all three readings for it to be considered compliant. If it fails just one of the readings, it has failed the test and must be repaired before being re-inspected.
The California law set 95 decibels as the legal noise limit, and the test procedure allowed an error factor of plus or minus 1.5 decibels to account for ambient noise.
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