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Reply to "Why are 180 headers illegal in CA?"

My guess would be this:

An exemption from Vehicle Code Section 27156 (VC 27156), California's anti-tampering law, is required before any add-on or modified part can be sold in California. Manufacturers interested in obtaining a VC 27156 exemption for an add-on or a modified part should fill-out and submit an application form to the ARB for evaluation. Detailed information on how to do this can be obtained from the document, "Procedures for Exemption of Add-On and Modified Parts," amended June 1, 1990. (PDF - 2.54MB)
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