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I will not have my custom tunes until June (so it looks). Can I go in and change the ratio and tire size via the option screens?
Yes you can, you need to figure out your tires rev's per mile and put that into the programmer. The easiest way to find it out is go to the maufacturers web site of your tires and it should tell you in the tires specs Even with the canned tunes you can adjust just about anything you want But all you do is go into options and change what you need to change.