4g92P : If possible find ecu, wiring n airflow sensor. KLu xde duit, Need to add 1 more solenoid into ur distributor, find airflow sensor code 449 or 454 (MMC). Need to change head gasket too, if possible metal since ur pistons arent high comp. ur pistons will last longer. ur fuel reg, try to get adjustable and ur and injectors to change as well. Ur mivec can be activated thru ur A/C relay. If u want more kick try to include 4 throttle system fr 4AG, very nice response.
4g93T: Very challenging. A lot yg meletup la. You really need forged pistons if possible. Or at least E manage to control ur Mivec n boost doesnt activate at once. SAFC with VAFC pun boleh, but make sure u tune up properly. same as above, u can use GSR ECU and activate w ur A/C relay. But a lot yg blow due to mapping x cantik. If possible dont up boost if u r using GSR pistons. Block will crack easily.
Hope this info helps....:)