I couldn't find a straight answer so I actually called the CHP HQ in Sacarmento a while back and spoke to an officer after call ing the CBAR which gave me shit. (Supposedly SoCal & Norcal are night and day but it better than hearsay)
You don't have to register your car in Cali as long as your in the military but you do have to smog your car in the state to get a DOD decal.Usually once or maybe twice depends how long your here) So technically you suppose to be following the state laws. Now if you get stopped he said they can write you a ticket and send you to the REF but you can just tell them you drove you car back and they can't do much to you when its time to show up. (Officers words) Actaully he was non bias, helpful and explained alot of things about why officers pull people with modified cars over.
IMO its a gamble cause even he couldn't give me a black and white answer.
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