Most cities settle fines for excessively blaring mufflers.
Park the vehicle on a flat, level surface. Create a test area that is at least 25 feet away from walls, buildings or other structures to minimize echoing.3. Start the vehicle and leave it running.
These meters can be rented from an automotive repair shop specializing in muffler repairs or an electronics repair shop. A decibel meter must be used for this exercise, as there is no other accurate way to calculate the sound level of the exhaust.
2.Muffler bang laws are on the books of many municipalities, and many of them actively enforce those laws by calculating the highest sound consistent of mufflers on registered automobiles and motorbikes. In aligning to be used legally, mufflers trumped-up for most on-road and off-road applications cannot exceed a sure decibel amount. For instance, California prohibits aftermarket mufflers from exceeding 95 decibels in clatter. The sound level of a muffler must be calculated using a decibel metre with an outmost microphone.
Instructions
1. Purchase a properly calibrated decibel meter.Place the decibel meter at a 45-degree angle 20 inches away from the muffler. Remember to set the meter weighting to "A" for measuring noise levels as heard with the human ear.
4. Have a partner depress the throttle of the vehicle being tested to raise the engine to 50 percent of its maximum revolutions per minute (RPM). Read and record the number shown on the decibel meter. Turn the vehicle off when finished.
