Originally posted by: IGBT
Text
The Noise Code for each State should contain, but not be limited to, the following essential provisions:
Most legislation I've seen uses the SAE (Society of Automotive Engineering) J1169 testing method which is described at the bottom of this manufacturer's information of one of it's products:
http://www.airpowersystems.com.au/us_sp...hausts/apswrx-hoe-r5/apswrx-hoe-r5.htm
California legislates below 95dB per this standard, and 95dB with this standard is above my threshold of what I would call 'annoyingly loud'. It's surprising how loud is technically legal. Here in CA, if you get a ticket for exhaust too loud, you can go to a referee who will test with the J1169 method to clear you of the ticket (for a nominal fee, of course). This was a relatively recent implementation (within the last 5 years at most) as enthusiasts were up in arms about getting unfair tickets on exhaust modification.
There were certain cities that would ticket just about ANY non-stock exhaust, as there is a section in the vehicle code that you cannot modify an exhaust explicitly for increasing noise (whistle tips for instance). They would cite with this section of the code and people wouldn't know that their particular mod was legal (replacing a rusted out exhaust with a louder one, or replacing for improved performance)
Perusing the vehicle code I noticed this new section since I last looked (effective Jan 2004):
Exhaust Systems: Whistle-Tip Prohibition
27150.3. (a) A person may not modify the exhaust system of a motor vehicle with a whistle-tip.
(b) A person may not operate a motor vehicle if that vehicle's exhaust system is modified in violation of subdivision (a).
(c) A person may not engage in the business of installing a whistle-tip onto a motor vehicle's exhaust system.
(d) For purposes of subdivisions (a) and (c), a "whistle-tip" is a device that is applied to, or is a modification of, a motor vehicle's exhaust pipe for the sole purpose of creating a high-pitched or shrieking noise when the motor vehicle is operated.
Bubb Rubb should be proud, he helped craft the California DMV code. This in addition to the section stating exhaust cannot be modified solely to increase noise, which should technically already cover whistle tips. Gotta love the redundancy of bureaucracy.