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Ok, just because i am anal sometimes i have to add this:
a manifold is what 95% of cars come with. it is a basically untuned collection pipe.
a header on the other hand (as seen in the post above mine) has pipes of tuned length so that the pulses of exhaust gases meet at the right time causesing a very smooth and fast flow.
saturn put headers onto their early 90's SC2s for a couple of years and the EPA bitched them out so they went back to manifolds, and is why most cars come without headers.
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