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4-2-1 headers seem to improve low end power better than high end power and 4-1 headers improve high end power more but i've heard that they can cause you to lose low end power.
i personally would go with a 4-2-1 header
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97 civic hx
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mod list: CAI, 17" wheels but now removed and much more to come.
not much of a list yet really
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