There are no California legal aftermarket headers available due to the law:
For the sales or installation of a California Aftermarket Catalytic Converter, the following are legal requirements:
(1) The vehicle must be specifically included in the vehicle application list that is maintained by the California Air Resource Board
(2) The vehicle must be more than 7 years old or have more than 70,000 miles on its odometer
(3) The vehicle must be beyond the coverage of the OEM catalyst warranty period. This period can vary from 7 years or 70,000 miles to as high as 15 years or 150,000 miles. Installers may reference the vehicle owner’s manual or warranty booklet, or they may contact the vehicle manufacturer or dealership to verify the applicable OEM California catalytic converter warranty
(4) The vehicle must have a legitimate need for replacement of the existing catalytic converter. If an installer is making your repair, this must be documented on the repair ticket. Also if the OEM catalytic converter is present, the installer must make a determination that it is not functioning properly before replacing it
(5) The aftermarket California catalytic converter must be installed in the same location as the OEM California catalytic converter it is designed to replace. The front face of the replacement California catalytic converter shall be no more than 3 inches further upstream or downstream in the exhaust from where the front face of the OEM California catalytic converter was located. The installation may not alter the location, position, or orientation of oxygen (O2) sensors upstream and downstream of the California catalytic converter
(6) The aftermarket California catalytic converter must be installed on a one-for one catalytic converter basis;
(7) The aftermarket California catalytic converter must be installed with all other required catalytic converters (meaning you cannot consolidate the catalytic converters, nor can you add additional catalytic converters)
(8) If an installer completes your repair, a warranty card must be filled out by your installer, signed by you (the customer), attached to the repair ticket, and a copy must be returned to the catalytic converter manufacturer.
(9) If an installer completes your repair, they must keep documentation regarding the installation of the new aftermarket California catalytic converters including all of the above information. This documentation shall be made available to the California ARB or its representative as provided for in title 13, section 2222(b)(8). All such records shall be maintained for 4 years from the date of sale or installation of the California catalytic converter.
