My question is y u wanna to change to 1.6 or 1.8 gearbox?
If u change to bigger cc gearbox the gear ratio will be different and u will feel underpower, somemore the FC will be higher.
Better stick with the gearbox u have now..
Good Luck..
i heard from somewhere that when u install fuel management/piggyback to a VVT-i/DVVT engine, we must first diable them... if not, it will be quite hard to tune the fuel....
is that true?? i highly doubt dat la...but...