I have the 03 JDM V8 STI motor with AVCS and the twin scroll VF37, i have heard that the JDM motors are tuned to run on US gas (93 oct) and that they will knock and could cause catastrophic failure eventually. I did a couple runs and logged them, and as soon as i start boosting in 3rd, it is definitely knocking. Are you aware of anywhere i can find a basic tune for this motor on US gas, or do i need to just pull my timing?