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From what I've heard on the forums and seen from a few dyno graphs upgrading to after market headers gives you little to no performance gains. At best I think I've seen 3WHP. If yours is cracked or rusted then by all means get new ones, otherwise I wouldn't spend the money.
Speaking only from a stock perspective. If you have other modifications that have increased power then the stock headers may turn into a bottleneck, but you'd have to be well over stock performance.
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