Well if you are going with the gotts mod you will not need a custom tune, thats just for the aftermarket cai. I personally went with an 87 performance tune just because I dont care to pay extra for 91+ octane. So I think if you dont mind running the higher octane just go with the canned. But I have read a lot of post about people loving the custom tunes more than the canned on the basic stock trucks.
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