I have B16A head with B20B block in my car now. My modification is standard i/h/e, fuel pressure, and Crane Cams coil. Currently I'm running OBD-0 PR3 ECU (came with the engine). Then I met someone seems know a lot about B series engine and he told me I should change to P28 ECU (I think is OBD-1 from Del Sol). He told me by changing the ECU alone I will get better car performance (he mentioned the HP can go up as much as 15HP),is this true? Is it OBD-1 P28 ECU is better then OBD-0 PR3 ECU? If I do change to P28 ECU what parts do I need to change? And do I have to change the wiring completely? Thanks.