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Aye, neighbour; around here, I hear more about Alberta than the rest of Canada, because that's where the kids got work.
You are probably about to be hosed with opinions about exhaust gas velocity vs temperature, the necessity for backpressure for various functions, etc. It would be nice to have a system tuned for a steady cruise if you have a preferred output level. Those lumps in the power curve charts are from resonances. All else being equal, though, bigger pipes and reduced backpressure help a bit for cruise, and several bits at max HP. However, factory engineers don't seem to put bigger pipes or better manifolds on their super-economy models.
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