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Not sure I totally understand your question.
It is hard to beat a Zork tube in any measurable way on a turbo.
Look for a smooth transition from the turbin housing to the tube. Any step will create turbulence where you do not want it.
Other than that, anything that takes the bends out of it or makes them larger arcs might help.
A transition to a larger size tube starting at the turbo could help as long as it dose not do so to quickly.
Still, little would probably be gained from any of these improvements.
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