CARB stands for California Air Resources Board which is the "clean air agency" in the government of California. The stated goals of CARB include attaining and maintaining healthy air quality; protecting the public from exposure to toxic air contaminants; and providing innovative approaches for complying with air pollution rules and regulations.

Basically any automotive part that meets their standards on emissions can be used in vehicles equipped with "California Emissions". Since the levels of emissions from vehicle exhaust is the strictest in California, any part that meets the CARB standard is 50 state legal.

All items here are CARB approved, 100% CA Legal, you can register without any trouble and risk in California. If buy other model from other store, then you have the register risk on your own.