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Originally Posted by sracing
Yes, but it's not quite so easy to make that generalization. All things being equal, the 4:2:1 are going to provide a wider HP band. Long pipes more HP at lower RPM's and short ones at higher RPM. But the size of the pipe and the merge point are going to determine the total performance.
BTW, I am not a header expert. My expertise is only in doing tests for header companies.
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I thot it's the other way round, i.e. longer pipe for more top-end horses (as featured in most 4-1 systems, and virtually most, if not all, aftermarket 4-1 headers for Hondas)?