Within the Gryphon you can adjust for rolling diameter changes without having to utilize custom tunes. However, I would most certainly look into getting some custom tunes to balance out the performance aspect that will be effected by the larger diameter wheels. Just my $.02...
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![](image.php?s=999a547ad84af59158e3c2a6b4b94bf0&u=439&type=sigpic&dateline=1335206426) 04 F150 4.6L / 04 Excursion 6.0L
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