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Scientifically, Bassini step headers are excellent for low end torque (gotta love equal length primaries) . They sacrifice a little torque compared to 4-1 long tubes in the high end, however they have more area under the torque curve in the 2-4K rpm section (excellent for street/track driving where you won't always be at redline)
These are certainly on my must have list. Best price I've seen is here: