An amazing yet limited Ecoboost
Or you could Supercharge the current 6.2l Raptor with a CARB legal Whipple/Roush and have obnoxious amounts of power over that TT V6...which is already peaked out. That's just the thing with the Eco boost, they are what they are and you can't really upgrade anything other than airflow at the intake and exhaust. Doing turbo or fuel enhancements will probably start putting you in dangerous territory of losing an engine. At least with the current 6.2l V8's, there is a ton of room to do more to them because of their stronger bottom ends, and 50-state legal for that matter.
That all being said, a TT 5.0l would absolutely change my opinion on the matter and leave a supercharged 6.2l in the dust. I'm all for the development of that engine because I love having an ultimate 4x4 machine with a side of sports car in it. Don't get me wrong, the V6 Eco boost is a fantastic engine with tons of R&D behind it, but you are pretty much stuck with whatever power it has because Ford has squeezed out of it just about everything it can do. For someone like me, I like to build on my Trucks and constantly improve them in all aspects, and the V6 Eco boost is going to be too limited for me in that regard.