Originally Posted by
BAMF
WHAT THIS MEANS FOR YOU
There is also nothing in this statute which says the officer has to use a decibel meter to measure your exhaust. It does not have to be louder than a certain decibel to be illegal. It simply has to be louder than stock. While the law instructs specific areas to set their own methods of measurement, it does not take a decibel meter to figure out if an exhaust is louder than stock.
Actually it does.
"Sound level" means the A-weighted sound pressure level measured with fast response using an instrument complying with the specification for sound level meters of the American National Standards Institute, Inc., or its successor bodies, except that only A-weighting and fast dynamic response need be provided.
Here's some info on A weighting.
A-weighting - Wikipedia, the free encyclopedia