Changing gearbox means dat existing ECU need to re-map?Agree wif u.Many people didn't noticed this but S80 gbox from dc2r 98 specs is expensive la.Trade in ur 4.4 gbox so can cover half of the cost.If u just put the 4.785 fd into ur eg9 stock gbox then it will be disaster at hway.Just feel like want to add one more gear je.