K & N
If your talking about the drop in replacement for your existing filter, i put one in my previous truck, absolutly no performance difference, the only benefit is you don't have to replace it, just clean and re-oil it (K&N calls it a "recharge kit") at about 50k miles.
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Check Troyer Performance. They have a drop in from AFE available for the 04 5.4 3V. Suppose to be better than K&N but who knows - they all look the same to me except for the tent each manufacture puts in their oil.
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