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My expirience was that it did not help or hurt my FE, in general. However, if I were able to pulse and glide, then having more torque below 2500 rpm would help. I'm ATX, so when I "pulse and coast" I can't stop the engine from reving up past 2500, so for me I felt (this was pre scan gauge) that there was an increase in torque during this spirited acceleration, and it seemed to make the pulse length shorter. No real testing was done, more of a subjective feeling. I went with a 4-2-1 header, but it has very large primaries.
Hope this helps your decision.
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