Crusher exhaust systems for non-catalyst equipped motorcycles as well as slip-fit mufflers that mount downstream of catalysts is considered legal replacement parts in California. California does not, however, permit the use of aftermarket exhaust systems that remove original equipment catalysts unless a California Air Resources Board (CARB) Executive Order has been issued.
If you have any questions on sound and emissions regulations, please check with your local laws and regulations.
Some Fuel management systems are not legal for street use in California. For systems legal for street use in California, please refer to CARB E.O. No. D-632.
CALIFORNIA EMISSIONS NOTICE