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unless you have a very unique setup with an intake that you have not done maf scaling on and maybe nameless or ace header the oft tunes work pretty well.
just an e tune should be able to sort out intake issues , unique header mabye require dyno time
but otherwise flash and go tunes are pretty good if they match your mods, i have even heard the reputable ecutek guys say that getting a dyno tune on one of their flash and go type tunes NA will yeild little extra.
it different for boosted guys but on NA theirs not much in getting a full dyno tune over an e tune.
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