You can max out the 2.7 EcoBoost on the F-150 and Fusion Sport very very easily with just a tune. People have argued with me on this in the past, but the F-150 and Fusion Sport 2.7 engines are essentially the same in terms of how they perform (whether one uses Borg Warner K03 and the other uses Garrett GT154x doesn't matter from this perspective). The torque models are the same, the inferred turbo compressor maps are the same (with the exception of the compressor speed lines), speed density tables are the same, etc... the main differences are the throttle body tables, intercooler volumes, and some of the VCT tuning. The torque model tables being the same is the most critical aspect, as it essentially maps out the volumetric efficiency of the engine as a whole. E.g. At 2.20 airload and 6500 RPM, the engine is expected to produce X ft-lb of torque. If these values are tweaked significantly without actually changing the hardware that impacts VE (turbos, cams, displacement, etc) it can cause the wrench icon to turn on. So the F-150 2.7 and Fusion Sport have identical torque model tables.
The F-150 has an engine oil cooler while the Fusion Sport does not have one (It'd be right next to the oil filter). The F-150 and Fusion Sport both max out the turbos around 44 lb/min at 20-22 psi. But the Fusion Sport is at or beyond the choke line at this flow rate, and the turbine speed is 260k+ RPM (inferred) creating massive amounts of heat. The data I saw for the F-150 2.7 showed that IAT2/MCT delta over IAT at 44 lb/min was 60F-90F or so, which isn't too bad but this wasn't at the track. For the Fusion Sport, flowing 44 lb/min at 21-22 psi results in a MCT/IAT delta of +110F at the track with heatsoak. But 42 lb/min is an easy flow rate for both F-150 and Fusion Sport. Stock is 36 lb/min on the Fusion Sport.
I have yet to see any solid data on aftermarket IC's for the Fusion Sport, aside from some of the non-DMR Generic SAE/Torque/ELM327 style logs. If that MCT/IAT delta can drop to about +60F at 44 lb/min with heatsoaking at the track, it might be a worthwhile upgrade as long as there wasn't any more turbo lag , but based on the STFT data I have seen, the turbos are way beyond their efficiency when flowing 44 lb/min at 20 to 22 psi on the Fsport.