According to Joey of Harmony, he said for my RD2, the ECU will need to be sent to Korea for tuning. His program doesn't have the specs for this. The problem is that it takes time to ship, tune and return to us. It would be good if they have a spare ECU to swap.
It should improve FC because the new fuel mixture will be leaner, creating a more optimize combustion. Original ECU program are using a just too rich fuel mixture based on the better fuel grade that we used here in Malaysia (RON97) compared to other less developed tropical countries (RON90,91, etc).
Also, the ECU programming will increase the max rpm before cutoff... I was told Tuscani9889's max RPM has been increased from 6200RPM to 7200RPM. I sat in his car and he revved the car maximum lar.....