K&N used to be the front runner in air intakes, I think there are much better options on the market now a days. If you do your research as to which brand offers what for your specific vehicle it will pay off, in the long, long , long run. You may only notice a half or full mpg increase but depending upon what you put out, annual miles traveled and the cost of fuel it will eventually pay off if you keep the vehicle long enough. I drive a completely different vehicle than an ecoboost, an F350 diesel. I paid around $350 for an AFE intake, the in dash liar reads around 1.5mpg better in town and just about the same in tow. I only made one towing trip with it after install so I don't want to say that is definitely true as I put it on the day before the trip and wanted to play a little to see how the performance was. It should pay for itself in roughly a little over a year based upon my driving style. As far as power goes, I have never felt a mod outside of a tuner make this big of a difference, as stated completely different vehicles and huge displacement disparity. But for my truck I don't think there is a better intake out there. Point is, do your research and keep the vehicle for a while and an intake very well could pay off.
Also, I prefer the dry filter (oil less) as I've heard too many rumors about oiled filters clogging mass air flow sensors. I really think that is more of a end user error of over oiling, but with the option available I went on the safe side.
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