My AEM CAI has been a performer in my 14 GT/CS. It has a closed air box, filter meter, and utilizes the factory cold air snorkel from the grill. As soon as I installed it, I gained 1.5 miles per gallon. I then added an X-Pipe and Corsa Sport axle-back and gained another 2 miles per gallon. When I drove the Mustang off the lot, for the first year I averaged 19.3 miles per gallon combined city/highway. After my mods., I now consistently average 22.5 mpg. My fill-ups used to read 292 miles, they now average 331 miles. Personally, I'm sold on these mods. If done right, they can be a big benefit and show some solid gains. Also, the AEM has a closed air box like the factory so water from the hood vents doesn't pour into the airbox. Additionally, I noticed improved throttle response and improved sound. Just my humble opinion.
2014 Mustang GT Coupe Premium. Options include: California Special package, comfort package, navigation, glass roof, shaker pro system, 3.73 ratio limited slip axle, GT front grill/fogs, MGW race spec shifter, BBK X-Pipe, Corsa GT500 Quad Sport axle-back, Ford Racing ProCal tune. "If I wanted insane HP, I would have purchased a 2014 Shelby GT500!"