serious? damn you lucky bastards. suppose its different state to state, but not having to worry about modifications being illegal would be a nice change of pace, and a lot less stressful. also cheaper in the scheme of things
Technically, there are "rules" for the daily driver plates. Any emissions equipment that it had from the factory is supposed to be in place and functioning. But the flip side of that is the inspectors never actually know
what the car is supposed to have, so as long as any modifications look somewhat "factory", or anything you take off looks like it was never on there originally (charcoal canister, smog pump, etc.), you're fine.
Also, installing a newer engine means you have to pass the emissions standards for the year the engine was made. But again, none of the inspectors actually know what engine the car is supposed to have, so...
And with the rolling 24-year-exemption from smog testing, that means that right now I can swap in an engine as new as a 1988 model and still not have to legally pass smog.
Thankfully, 90% of the inspectors in my town don't even open the hood on the smog-exempt cars.