California · Vehicle Code
VEH §38391: No person shall install, sell, offer for sale, or advertise any device, apparatus, or mechanism intended for use with, or as a part of, any required off-highway motor vehicle pollution control device
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No person shall install, sell, offer for sale, or advertise any device, apparatus, or mechanism intended for use with, or as a part of, any required off-highway motor vehicle pollution control device or system which alters or modifies the original design or performance of any such motor vehicle pollution control device or system.
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