After some searching through the forum, the Unichips seem to be the duck's nuts for piggy back ECU remapping. However, there is no way I can justify the money >$1600 for a local to supply and fit and I don't want a cheap chip that solely increases rail pressure. So my options are to follow the lead from here and import one and be presented with the problem of finding someone to tune it. The other option is for ECU remapping but I don't know the specifics of what is done here, as it seems to depend on who does it. So to open the can of worms, import a Unichip and find someone to tune it or look for ECU remapping?