You would be very hard pressed to find another vendor with more EB achievements, support for and/or a larger following than we are fortunate enough to have.
Here is the breakdown on a tune's supporting mods:
3BAR MAP- NO BRAINER! The 3 BAR MAP sensor allows us to better measure, map and apply higher than stock levels of boost throughout the powerband. The part itself does not make more power, but it effectively allows us to turn the EcoBoost's engineering against itself to make better and more effective tuning for you.
160* thermostat- Again, a no brainer. This allows us to again tune slightly more aggressively by keeping coolant temps down and fighting detonation.
CAI- This is a great mod if you want a couple (~7hp) and more cabin noise on a stock exhaust truck. If you add exhaust components that is where the real power gains come into play!
DP- Totally worth it from an efficient performance perspective, as they allow your turbos to spool more freely. The peak gains are good, but that is not the important part of the story. The DP's will allow you to make peak power ~500 RPM sooner, hold that power for about another 500 RPM and then continue to make more power again for ~500 RPM.
Catback- The similar rules apply here that do to the CAI. If you want a handful of hp and sound, cool. If you add the complimenting performance parts you get SOOO MUCH MORE!