Nelson, if I switch to an 02 os I don't need the actual pcm right? I can just download the 2002 os from Holden crazy and flash it on my pcm? I tried that when I first started Trying to tune this thing. Still saw the KR plus I had a battery light stuck on. Switched back to the 99 os and no more batt light. All the work done on this tune is on the 99 os. Like ve tuning using the ltft and stuff. It was alot of time and we got the afr and fuel trims looking pretty good now. Just getting our ass kicked by the timing cause of KR. If I go 02 os I loose all our progress correct?