9MR didnt make it to australian shores, although I am not sure what improvements they had over the ADM IX anyway. You arent able to import the IXMR (other than personal import) as the IX was imported for the domestic market unlike the 8 which was low volume only. The 8MR was an 8.5 and had some of the innovations of the IX (bigger turbo, ali roof, trick cams) but the 9MR didnt have any of the updates of the X given they are a completely different platform so possibly only a few cosmetic tweaks.
Would be very hard to get your hands on a genuine IX MR in much the same way it is to get hold of an RA-R etc. The subie would be a more special rare car to own. But the evo would hand it its arse.