I am selling my K&N intake for the X, it is used, 150$ shipped. The X is becoming my wifes primary vechical so I decided to remove it, I do believe it gives more power and mileage, I have got 20.X mpg on a regular basis (by not exceeding 2100 RPM) even more on strickly highway tanks. Definatly more power when you floor it and it sounds badass.