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The porsche post engine swap? Can't you just get it approved before it happens, once approved I'd have thought it stays that way
I doubt they'll test/approve such a low volume engine tbh. Also, it's not going to be mapped for anything other than the shoutier side of things, so whilst it'll have proper cats I don't know that we'd pass the tests (but hey, we might do - the E63 does after all).
^Yeah, it's to give people a shove to scrap older stuff, which typically is dirtier than modern kit.
Of course, there will be outliers, I suspect I'm one- the 3.7 litre won't pass, so will stay at home in preference to the 5.5 litre twin-turbo which does.