The book stops short, however, on how to adjust your AFR via adjusting MAF curve and fuel injector on/off times.

mikel wrote:8r9 will be that latest revision that you can use then.

What am I loosing by not being able go beyond 8rx?

I used the alternate file version posted in this thread by Mike. Once the download completes my Predator Lightning reboots and then gives an error message "application missing". I can reinstall v8r9 just fine. My serial number is 2000012 toad-1114645118.

Don