A "chip tuner?" will not add any horsepower. It adjusts engine parameters, for maximum power(fuel,air,timing,shift point,rev limiter). You can get more power, by running 91 or higher fuel. The 3.5ltt detunes for low octane. Engines do not have hidden power. The factory engineers squeeze everything out and test for best economy, reliability and performance. 0-60 can be improved with a rear end, ring and pinion swap 3.31 to 3.73. To add 100hp, you have add nitrous(not recommended).
Again....
WRONG! Factory tunes vehicles for a balance of Power, Longevity, and Smoothness. A "Programmer"(LMS, Unleashed, SCT) or "Inline Module"(JMS BoostMax), will add power, and it is a LARGE gain. The advantage of a Turbo, is in most cases the Max Boost(PSI) can be tuned higher. That additional air combined with additional fuel means more HP and Lb/ft. If you were talking a NA motor, there is very little to be had by a change in programming, but on these EB motors, plenty is there! Also, as you can see in the post that YOU quoted, he already has the 3.73.
Info for BoostMax:
Stock 2014 F150 - 3.5L Ecoboost DynoJet Test on 91 Octane, Knob @ 100% Stock = Blue Line: 309rwhp / 374 ft-lbs BoostMAX = Red Line: 398rwhp / 455 ft-lbs Peak gains of: +89rwhp and +81 ft-lbs Boost Increase = +5psi(2014 F-150 is actually the closest to the 15-17 Expy in engine calibration and output)
Info for LMS MyCalibrator:
As seen on the F150, this engine has an impressive amount of room left in the calibration, our Performance tuning unlocks that hidden potential with peak vs. peak gains of over 77hp and 82 ft/lbs of torque, with maximum gains of over a staggering 95hp and 95 ft/lbs of torque on our 93 octane performance tuning. In addition to these powerful performance tunes, we also have towing specific tunes available for performance, without sacrificing the utility these vehicles are designed for.
I have both. Had the BoostMax on the 2015 Expedition for a short period, but Never turned it up to Full cause the wife ran 87 most of the time. Now we have the 17, and waiting on the 10K mark, have about 1500 to go.
I run an LMS tuner on my Edge Sport with the 2.7EB. I typically have the 93 Aggressive tune loaded, and IT IS FUN!
I was thinking of getting an LMS MyCalibrator for the Expy, but I will probably stick with the BoostMax. Just cause of the Easy adjust ability on the fly for different Octane. Disadvantage is no Trans Tuning.