Originally Posted by battlerattle
Dont put to much emphasis on the 6.4. The numbers are only marginally better than the 5.7, the only big advantage is the larger displacement allows the use of MDS (can be a headache in itself).
It really looks like alot, but when you factor in where the numbers are available (RPM wise) and drivetrain losses its really less than a 10% improvement. You can get that plus more with tuning on a left over 2013 and still be chaeper than a 2014. As for the coil suspensions it is hit and miss. I liked them for overall ride quality, but not for towing/hauling (they feel wiggly to me).
This ^^^ is a pretty accurate assessment