So Before I bought the tune I raised the the issue of climate difference (between US&Aus) with RR and they mentioned that I buy a techstream cable in order to record a few runs, so I can send across the pond to them
So they can monitor how the ECU has adapted to the new map and make any necessary changes if need be
maybe just me being ocd but all precautionary, plus I love that the dudes at RR are so pro Lexus Fâs