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4-2-1 traditionally creates a broader torque band and 4-1 a higher HP but a peakier torque band. However most high level race cars i've seen run X-1 type header (x being the number of cyl) and good race teams say its area under the torque curve that makes a car fast. So i would have to say its more down to the design of the individual header rather than its configuration that matters.
Also why are the P&L and FA20Club headers considered long tube? The runners are shorter than most of the others on the market like the JDL ones for example.
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