Quote:
N.J. Stat. @ 39:3-70 (2002)
@ 39:3-70. [Mufflers]
Every motor vehicle having a combustion motor shall at all times be equipped
with a [muffler] in good working order and in constant operation to prevent
[excessive or unusual noise and] annoying smoke, AND NO PERSON SHALL MODIFY THE EXHAUST SYSTEM OF A MOTOR VEHICLE IN A MANNER SO THAT THE EXHAUST SYSTEM EMITS IN EXCESS OF NINETY-FIVE DECIBELS AS MEASURED BY THE SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) STANDARD J1169 (May 1998 ). IT SHALL NOT BE A VIOLATION OF THIS SUBSECTION UNLESS PROVEN BY PROPER AUTHORITIES THAT THE EXHAUST SYTEM MODIFICATION RESULTS IN NOISE AMPLIFICATION IN EXCESS OF NINETY-FIVE DECIBELS UNDER THE PRESCRIBED SAE TEST STANDARD.
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The Society of Automotive Engineers (SAE) with an established noise limit of 95-decibels (SAE J1169). Under the SAE standard, a sound meter is placed 20 inches from the exhaust outlet at a 45-degree angle and the engine is revved to three quarters of maximum rated horsepower. The highest decibel reading is then recorded...
I've never heard of a case of an inspection station actually having a decibel meter at the facility, so technically they cannot fail you for loud exhaust (unless they actually test it).
- Justin