just for interests sake from what my engineer guy tells me and what ive heared from others the australian ones have the better drive ratio in it .. but they had longer ratios in the box itself and no LSD up front
its the 185 RC/Carlos sainz/Group A's that had the 3.9 final ratio .
Youll find the Australian spec St185 shares alot of the group A components ( Diff and turbo are two examples i know of already ), we just got the lesser ECU and intercooler setup , the gearbox is not short ratioed like the group A