Cal. Veh. Code § 507.8

A “remanufacturer” is any person who for commission, money, or other thing of value, produces a vehicle that consists of any used or reconditioned integral parts, including, but not limited to, frame, engine, transmission, axles, brakes, or suspension which is subject to registration under this code. A remanufacturer is not a person who incidently repairs, restores, or modifies an existing vehicle by replacing or adding parts or accessories.