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Originally Posted by Dean
VThere is even a theory that pipe diamater should decrease in the uppipe to increase velocity as the gasses enter the turbo. The gotcha with this is that it produces increased back pressure in the headers which can diminish power.
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Hmm... I would be wary of following this theory because turbines are energy driven devices, and energy is not confined to velocity alone. Deltas in heat, pressure, & velocity should all combine to spin the turbine. I wouldn't want to sacrifice one for only a modest increase in another...