Yes I’m aware the KAI engine is a slight variation, but afaik it’s very slight.
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I can only speculate, but I would guess it’s a matter of the T-50 having a more efficient and aerodynamic aerofoil and fuselage that better facilitates a higher top speed. I don’t know the specifics of the T-50’s performance stats. Is it universally faster, or faster in a very specific flight regime?