Not sure which 2011 Ford Fiesta Air Intake Systems are right for you? We have over 2 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Hsiao P from Portland, OR said, "The injen SP9015 cold air intake enhances both torque and horsepower in full rpm range. Some of other vendor's CAI will go along with side effect(torque lost in low rpm), but this issue didn't occur on Injen's cold air intake. Therefore, I think that the injen SP9015 cold air intake is the most outstanding intake in the market."