All new vehicle regs from quite recently rather than what they've done in the last decade!
India is Euro 4 (about LEV) and China is EU3 I think (I'd need to check) for new vehicles. China also introduced pretty stringent fuel con regs that are way more aggressive than the EU or US. THe air quality probs come from older vehicles. You've got to start somewhere! The older cars will fall out of use and the overall emissions reduces. You've also got to remember that industrial emissions (In China particularly) are shocking. Not the cars to blame there (for once!)
I agree it is a lot of sensors and that will be part of the challenge. Yo are only talking about a few more than an existing EFI though. Compared with an existing twin engine EFI setup I'd guess you'd be looking at 2 O2 sensors (4 for CA). Two cats, poss two cat temp sensors you pointed out the need for. Probably tops 20 lbs the lot. If you follow the INDMAR approach and create a non-cast header, you'd save some weight there too.
Yes I appreciate that running a twin engined boat with current fuel prices is hard, so saving some fuel would help. What sort of typical problems are people experiencing with their EFI boats in service then?
Sterile enviroment? hehe I've been places testing that would make your ears burn chap. And I don't ever remember Yucca being that sterile; the boats over Labor Day at LHC were fun though and an eye-opener to someone from this side of the pond. Never seen that many boats in one place at once.
We do get a lot of information from real in-service reports and I always find that finding out how things actually operate in the real world and feeding it back to the process is more interesting than a lot of things. What goes wrong, why, how, get to the bottom of it and fix it. I don't know how you think big engineering companies work but if people didn't actually understand this stuff they'd go bust in very short order as no-one would buy their stuff! Perhaps there's a lot of companies over there with poor customer service, in-market backup and little understanding of their product. Or perhaps they're too big to care. The fact remains that you have to do proper durability and testing before launching a major mass market product or you lose your shirt!
That said, I always build my own engines and vehicles when work needs to be done, so I'm not the clueless lab jockey you clearly seem think I am!!
The way I read the regs it only affects new builds so if you use your used power plants then no problem. If you bought two new crate engines from a major manufacturer then I guess they'd be ready for install in an emissions compliant boat.