Where was this and what DA? I have yet to see a single eco crack 12's with just a tune. That is definitely not normal. Why did you trade up? If you buy 15-17 eco 3.5 like you want, you benefit from aluminum for the long run. The engine wise, the only issue with turbos is the coolant fittings can leak with high miles/heat cycles. It will not cause any kind of failure and is a slow leak. You could really just make sure coolant is topped off and keep going. Just keep good oil in it. More and more people are talking about Ram. The 19's top trims could be something to look at(i never would), but if you look at a 15 f150 vs 15 ram, it is not even close.