Pay attention to the 19th second in the video. Every time I see this aircraft from the tail, it feels like a Ferrari on LPG. For the AI-25TLT, only seems an additional connection at nozzle from outside (and probably some others inside fuselage) for closing gap. So I have the impression that when the KE's B variant is ready, all the KEs produced so far at that date will probably be able to get install more powerful engines without even returning to the factory, which will be something like AI-322F in the first stage.
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