For most people, including Sean, the benefits wouldn't be noticed in having a 6.7. But the motor itself is built better to withstand the higher temps associated All of the emissions junk. And I'd be willing to bet you will see the size playing a big part in making more hp then the 5.9 ever did. But like I said, this wouldn't be noticed for the average person because you'd have to ditch all of the emission stuff which no one has come up with programming for. And plenty of mods on top of that. So yea I'd say for me, I'd take the 6.7. But for Sean it's a little more difficult. the 5.9 would be an awesome truck and he'd pretty much not have to worry about a thing. But the 6.7 is easier to get your hands on at the moment.