I am using Obit piggyback for my supercharged 4G93P.
You can adjust both ignition timing and fuel supply with it. Because it can hold 2 maps you can keep standard tuning and power tuning which obviously drinks more petrol at your fingertip.
to risyia: wat? ur 4g93p installed supercharger? dohc or single cam one? let me know the more information. i am interested. but i using the sohc now. no power and fuel consumption is high... leceh..