We have 2 Ninja 250s - one with an airbox, no snorkel, and a Uni filter, the other with a K&N Pod (double inlet, single element).
Both have been tuned and adjusted, and run smooth throughout the entire rev range.
I'm not a big fan of pods, but my son (who rides them both a lot) says the pods are better - even in the midrange.
Either way, if you spend the time to do some research and are prepared to make adjustments you can get a CV to fuel well with pods. He's thinking of changing the other one to pods also.
The Ninja's airbox isn't an advanced design. Newer high performance airbox designs provide less turbulent flow and the volume is tuned for resonance to increase peak power or smooth power delivery.
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