TRD 3000GT Supra was a one off also, with pretty much nothing but the widebody kit and the upgraded bilstein shocks.
Toyota doesn't usually upgrade powerplants mid cycle. Supra got VVTi from 97 onwards but that was about it. JZA70 Supra got an upgrade from 3 litre Single Turbo 7MGTE to the 2.5 litre twin turbo 1JZGTE.
I think if they were going to introduce a turbo they'd have done it already.
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