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I think you will find that the torque curve becomes broader. I would expect it to reach peak torque quicker and hold it for longer.
That affect that you are referring to doesnt involve eddies. Eddies are a form turbulence. There is an effect like that in pipes all though its not as dramatic as that in the rivers as the bank provides a lot more friction then Pipe while and the density of water is a lot greater.. Because the gas is traveling under pressure velocity diminishes very quickly at the wall. If it is not possible to get a smooth wall then there may be optimum flow condition with a more rough pipe. This however effectively reduces the cross sectional area of the pipe resulting in the gas having to flow faster to achieve the same volumetric flow rate. Because this boundry layer of air on the wall of the pipe effectly removes friction. You will probably achieve laminar(layered) flow at higher velocities. This effect results in a pressure drop over the length of the pipe. This effect can be calculated.
Without consulting the text books i believe the worst case scenario is calculating the flow rate assuming no frictional losses against the wall of the pipe. To accurately modell this you would have to do some testing. Assume a worst case scenario or optimum operating condition possible then you know you are
below this and the exhaust is optimised for all conditions.
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