jap spec had a better ECU - but only had gains of about 5KW difference
Jap spec had more fancy shit like electric folding back mirrors , seats etc + also leather interior option
Foglamps on Aus specs were side mounted behind the grill mesh , jap ones had the option of two yellow lensed eyeball ones instead
( mine has no foglamps - never had em al all odddly enough )
Aus spec got lesser ecu , But better turbo ( led to believe its the same as the RC/group A - ie not ceramic )
All aus specs were widebody + not speed limited
All Aus specs for certain came with rear torsen LSD's
Aus specs hold their value better + insurance companies prefer them to Grey imports