[Excaliber]

Sky-chicken, NOPE no need for SB100. Your Excalibur is indeed a "real car". 100% manufactured by an authorized motor vehicles building business complete with Federal, EPA and DOT certificates. With the exception of a few early AC cars Excal's are the ONLY replica that can make that claim. If you have removed the the cat's (and a lot of people have) it could be a challenge restoring the exhaust system to "specs". The Aussies use some kind of side pipe catalytic converter which may well be legal and pass inspection, I don't know.

I guess you could say, in fact, there NOT a "replica", they ARE an "Excalibur". The year of the build of the car must meet all the smog requirements of the year in question. Smog pump, catalytic converter etc. Excal had a Federal Exemption on the "safety" issues (air bag, frame strength, seat belts, etc) and because of that exemption they ARE 100% legal in any state.

So what happened to Excal's? As I understand it when the Federal Exemption expired they would have had to go through extensive "crash testing" etc. to meet the guidelines. With the slow sales, low volume and ownership changing hands there was no money for such testing. The doors closed. The "plant" continued to make some kind of small enclosed "travel trailor" for a short time and then went belly up.

A standard electronic computer controller that matches the year of the motor should handle the "chip" problem. There not "that expensive" these days. I'd run the chip and swap out the controller only for "testing" purposes.