Sorry, not knowledgeable enough to comment on the flow bench.
What I do know is it's not all about flow. You also want velocity.
Generally speaking, air doesn't like to bend. A nice straight shot with as few obstacles as possible into the combustion chamber yields good performance.
Do not polish the intake track. A nice textured finish helps to keep the fuel molecules suspended in the air. A glossy smooth finish tends to make the fuel molecules "stick" to the walls and pools up.
The exhaust track you do want glossy smooth. You want the exhaust gases to exit quickly with it making a hard time for carbon to cling to the walls.
I'm no expert, but just trying to help out. Hopefully someone else who knows about this chimes in.
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My Yerban assault vehicle: 2.2mm stroker crank, 62mm Nikasil cyl, Taida large vavle head, American made valve springs, ported intake manifold, TM 28mm carb, stock CDI, Bando coil, TK exhaust, stock CVT except for the 14g sliders, 13/40 internal gears, 16T drive, 31T axle sprocket, 22" rear tires, and ONE BIG POTATO CANNON mounted on top..........
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