Hard to say i think the 6.4 is going to be the long lost truck, the new 6.7 ford is supposed to be the shiz but we'll see, if people keep moving on the 6.4 i think its going to run into some ussues holding power, mostly because of how many headbolts it has (10 per side just like the 6.0) but they are 16mm bolts stock so that helps but its going to be limited without something else.