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...should really depend upon how well the tuned pipe LENGTHS match with the FE-engine RPMS...if a multiple of the max RPM tuned length (or very ± close) the cylinder breathing and scavenging is helped, which benefits torque.
...however, the "got'cha problem" occurs when FE-engine RPMS fall "...in between..." and approaches a 'Helmholtz' quarterwave length, then the exhaust is trying to be stuffed back into the cylinder instead of being pulled out of the cylinder---bad,bad,bad.
...header pipe DIAMETER at lower RPMs shouldn't be a problem.
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