i have been flip flopping back and forth between just dropping another 5.3 back in or going up to a 6.0. and the reason is because i dont plan on modding whatever i get too much. so if thats the idea why not put a 8.1 in? i see tehm going for the same thing 6.0's go for. and they make tremendous torque. in a 1500 it would be nasty wouldnt it. its probably not a straight swap is it? probably need motor mounts at least. so whats the deal on the BB would the wiring not even be the same?