JDM STI tranny = JDM wrx tranny which I believe = USDM rs/wrx tranny
Now the STI RA gears are stronger.
The new sti 6-speed is now available, but it is expensive at 10k for the whole kit. (Its a great deal, but I dont have 10k) It includes more then just the tranny. It includes all the parts you need and the diff's.
-Chav