That is exactly what I am thinking. My thoughts are that the only gains you might see with an aftermarket CAI would come from a less restrictive, cotton filter, better heat shielding around the box, and possibly a greater surface area of the filter (not sure if the conical filter has more surface area than the square, stock filter).
IMHO, the stock intake doesn't really look all that restrictive, and it already gets its air directly from the cooler charge not coming through the radiator. With that said, the CAIs look nice, but not $300+ nice.
Current: 2011 Mustang GT, Kona Blue, 6mt, 401A (Cashmere), Security pkg., Brembo brake pkg., Comfort pkg., 3.73 gears, Electronics pkg.
Previous: 1967 Mustang Fastback, Aqua, 351W, C4 auto, pure unadulterated awesome