747,
I was not being antagonistic, you came up with a cocky reply and you know it.
I know of many N registered geriatric jets flying around without hushkits, perhaps they don't fly in USA but they are N registered.
Another example, your FAR flight & crew duty regulations. Wherever a G, VH, D, PH or F registered aircraft may fly in the world the crew operate to their own country's duty regulations.
FAR's have one set of regulations for flying within US airspace and hey, let's ignore those regulations if we're flying in someone elses airspace. Despite this, other countries do not dictate N registered crews work to that country's regulations.
Only the USA has such regulations that are only applicable within their own airspace, if you don't believe my ignorance then take a look in Jeppesens.