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for a sohc engine, the best best is a 4-2-1 header. this header provides more low to midrange torque than the 4-1. for a dohc engine, depending on mods and plans of FULL N/A power, the 4-1 is recommended. lots of high end power is capable with the 4-1. caution: there is some loss in low end torque with the 4-1. if in doubt, 4-2-1 is your best bet.
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