So title it in another state, in someone elses name even, and then bring your "used" Cobra back to Mass???
Actually, that is similiar to what some of folks did before replicas were legal on Oahu. Replicas WERE legal to register on the other islands and that made it much easier to "slip under the radar" when "coming back" to transfer ownership to an Oahu address. That method didn't always work, some of those DMV clerks are pretty sharp, but often it did. The worst thing that would happen was you would be denied the transfer and would then have to go to "plan B". Some folks actually flew to the mainland for the sole purpose of securing registration, plates, etc. and then returning home with said documents. But then, we drove around at night mostly, mostly we did, and never in large groups, pretty much it was all stealth mode. The cops knew, they looked the other way for the most part, not ONE of us EVER got "busted" for bad registration on the road. The DMV was what would trip you up! It was kind of cool, we had a hardcore secret club thing going on.