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all depends what you want from the header, its not really a one size fits all deal. At one time I compiled a list of what all the available headers use but I cant find it now. I want to say most are 1.63 or 1.75. General rule of thumb is smaller will help low end but choke up top, and the opposite with larger diameter. I remember some shop mentioning maybe making a "torque based" header with 1.5" for example, I don't think it was actually made.
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