[CarreraS2]

Of course, the present is the present.

In the future, there can be any number of ways that non-compliant cars are going to get busted. From drive-by smog tests becoming routine, to the exemption simply being repealed, or any other number of scenarios.

But as a practical matter, a private party building up a hotrod 911, and selling it in California, as the poster suggested, puts no limits on that party. I don't believe that the out-of-state private seller has to make any reps about the car being Cal smog legal - although presumably the California buyer of a hot rodded 30 year old 911 would know that it is not. But, the important thing is that the car doesn't need to be smogged to transfer title and issue the title to the new owner in California. He's going to just buy the car, and it doesn't matter what engine is in there, he'll be able to register it.

(BTW, I remember seeing some of these roadside smog sniffers being used at least 8 years ago in So. Cal.)