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A pod filter will do more harm than good in my experience. Air boxes are tuned for flow and resonance, and replacing them with a pod filter will hurt your throttle response and mid-range torque - costing mpg.
At WOT it may give you slightly more power, but it will hurt performance and MPG everywhere else.
Washable replacement filters like K&N aren't any benefit either from what I've seen, and usually don't filter as well as OEM-style pleated paper.
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