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You will gain a little drivability with a tune. A bit of power through the rev band. The mods you already have will make little or no difference. They are essentially cosmetic. In other words, if you went back to stock an then ran a tune, you'd get the same HP. If you replace the header, you can get a noticeable boost in HP. A header might, just might, work with those other mods to add some insignificant amount of power.
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