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The short version is, on carbed or throttle body injected gas engines you don't want to polish your intake at all, because the gas is actually small drops when it gets to the cylinder instead of a mist, so the turbulence from the rough intake helps to decrease drop size, increasing torque and fuel economy.
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That's for "wet" manifolds; carb'd or throttle bodied with fuel
and air flowing through. Most anything newer is port injected and the manifold runs "dry". Don't know what prevailing theory is on intake smoothness but I'd think the smoother the better.