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Ok so I did a 5.4 swap into my 03 v6 and I'm have some questions with the tuning..the ECU I have came out of a 4.6 that had already been programmed and I don't have the programmer that did it. Will tuning software like Sniper flash that tune away so I can put my own custom tune on it? Or do I need to go to ford and have them flash it back to stock and then buy tuning software? Any help would be greatly appreciated.


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