What you want out of a header depends on how you drive. Certain headers will give you lots of low-end torque, while some will trade torque for peak horsepower. Some will give you more mid-range. Headers are tuned for a sweet-spot of about 600 RPM where they give the most power. They are tuned pipes, like a pipe organ. If you want to know which header is the best, for you, ask the manufacturer where the RPM tuning is. Or figure out all the math and DIY.
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"I really like going fast. Just go off and meditate in the wind, you know? As corny as it sounds it works and feels good. It's a good way to just let the weight of the world off every once in a while...is this a big pose? I mean, yes this is a pose! I mean am I driving down the street to not get noticed in this thing? I mean rebellious is what this thing is I would say!!!" -James Hetfield
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