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I had a 2012 GT which I put a Steeda CAI and their 93 Octane Tune. The car was new with only 250 miles on it when I put it on but I did drive it hard enough to validate that the CAI and Tune make a noticeable difference in throttle response and low/midrange (<6K RPM) power. The Steeda CAI quality is good. I traded the GT (with stock CAI and tune) in on a BOSS 302. I will be putting the Steeda CAI, SCT Tuner, Ford Racing BOSS 302 Intake Manifold and ford install kit on the market very soon at a reasonable price if you are interested.
We make a Boss upgrade kit for our GT CAI. And you can certainly re-use the tuner on your Boss.