Perhaps an interesting coincidence but today I watched a documentary about the development of the YF-23. The max speed of the MMU is given as mach 1.8, the same number as the YF-23, at least officially. It went much faster than that. I believe the same is for the MMU when it gets the right engines.
I see some similarities of the MMU with the YF-23 and Su-57.
			
			I see some similarities of the MMU with the YF-23 and Su-57.
			
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