No, everything about the aircraft is obsolete which is why no other country has attempted to develop anything similar. The J58's are really dated, though most of the thrust is generated by the inlets when supersonic.
> most of the thrust is generated by the inlets when supersonic
I've often heard this (also about the bypass in Concorde's engines), but I've never heard a clear explanation about how some element of an engine which doesn't involve burning fuel can generate thrust. Can anyone explain it?
If I remember correctly, in the book Skunkworks they explain that it would increase the air pressure. The analogy made was that it was similar to putting a finger on a garden hose to partially block it, thus increasing the water pressure.
Obviously there must be some complex physics going on but that was the gist of it.
Probably someone with more knowledge can confirm or correct me :)
I think the StackExchange answer linked below covers interesting aspects of supersonic inlet behavior, but doesn't do a great job answering your specific question.
