These filters really don't add power, regardless of the marketing claims, plus manufacturers are locked into very strict regulations, most of these filters do not meet those regulations.
additionally where is the profit in giving a customer a reusable filter? dealers make money off over priced parts.. $50 for a filter you can get at pep-boys for $15.
The only advantage I've ever seen to a drop in filter is keeping the paper ones out of land fills.
The only advantage to full CAI's in a car with no internal
mods to the motor (upgraded cams and the like) is noise, increased sound to make the car sound "meaner" or more powerful which i personally like.
Same with
aftermarket exhaust, while it does help the vehicle breathe better without internal motor
mods, all you are doing is increasing the sound, which in turn decreases the MPG because the increased sound is directly related to how much pressure your right foot puts on the pedal.