For approximately a year and a half, California has been testing the noise of exhausts on ATV's. The good news about this testing is that approximately 90% of all vehicles, ATV's included, are in compliance with these laws. California ATV riders had the chance to prove that their vehicles were in compliance with this law via the SAN-sponsored law, which allows ATV riders to prove their compliance.
What this has done is proven that law enforcement regarding ATV riders noisy exhausts has been in error. Because of this, courts have been forced to dismiss citations that were issued for what were formerly considered "loud" ATV exhausts. However, only ATV riders who had been issued citations were allowed to take part in this test.
Most ATV riders that have performed modifications on their ATVs have more of a preference for exhaust systems which are aftermarket. Due to this testing process, consumers who do choose to upgrade their ATVs are at an advantage.
Currently there is no cost for performing this test. If you are an ATV rider who has been cited, there is a toll free number available for you to call: 800-622-7733. When you call, please have the citation and vehicle registration information handy.
For more information regarding your specific ATV And what noise regulations apply to your ATV, check out the website at: https://ohv.parks.ca.gov/default.asp?page_id=23038. (Please note: the only test that are included, are those that have A 101 dBa or less. Each list is set up by make, model, and year.)
