The emission standards are not the only thing to consider when bringing a Euro can to the US. They also require that the doors and bumpers be reinforced and the speedometer changed to MPH. At least they did in 1983 when I brought my cars over from the UAE. I doubt that the requirements have become more lax in the past 20 years.

Mostly I would say that it is not worth the effort to bring cars over. Check out WWW.collectorcartraderonline.com for MB prices in the US