You should be fine.
As far as power, if locked ecu, go custom jb4 route. But definitely worth it to get it unlocked. All dps are same. Catless are cheaper than catted. Catless will throw CEL unless it's armytrix/kenji iirc that have a cel eliminator.
Since you have a 25, and want a s58...
Disagree on this statement. If (usually is the case) that Supra owners of either mk4 or mk5 license plate reference (2fast or speed) are 98% The time modified heavily, or else it'll just look silly.
They know they either got a 9/8 second car.
Eh.
Mods off-set the clappness. Evs are buy what you get and that's it.
Safe to say eventually/most Supras are somewhat tuned or will be for AT users. I mean it's called a tuner car for a reason. And 95% of all evs you see are still slow. Only a handful of actual "performance varients"