9000RPM? Not on any Supra engine. The 1JZ-GTE *might* take 8500RPM if you build the living crap out of it (bottom end and top end).
You've been looking at RX-7's too long.
EDIT: Looking around it seems that the JZ's may handle past 8500RPM, but I'd plan on de-stroking, extensive valve train work and a complete bottom end build.
Why do you feel the need anyway?
You'll also need to go with a standalone EMS, the stock ECU isn't reprogrammable.