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On the same note as intake tuning, the exhaust, particularly the manifold, is equally important. "Backpressure" requirements are wholly a myth. Tune a custom header to the rpm range that you require more torque for, then select a pipe diameter and length that will support proper fluid velocity and meet helmholtz frequencies for your engine configuration.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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