If his custom file for you isn't locked and it was imported with an SCT/Diablo etc lidio could give you a range of timing percentage to increase on the handheld for the higher octane then YOU could modify his custom tune and reload the file with just that parameter adjusted..:beer:well I suppose I will buy it and figure out what to do with it later I will just call lidio again and ask what his opinions are I currently have 2 seperate tunes but maybe i would or could add a third if possible since i need to take my car back in the spring anyway