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Your entirely right, the upgrade of headers alone isn't viable for the money you will spend, it would only be a "good" upgrade if you were applying more than just that individual upgrade. Performance is the key, and as it does open up the flow of the exhaust, the rest of the exhaust and the amount of exhaust coming out if the head make a difference, again most of the upgrades you make are very slight for each individual upgrade and even tuned only make a difference when you add all the +3, +7, +?? up in the end.
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