On chevy.com they say the 2013 does 0-60 in 6.4. The 2014 is rated at 5.9. Is that not all its cracked up to be or would it be awsome to have the new setup?

Feeling depressed.
How can I make my 2013 6.0 flat? Looking at injen cai but that may not get me quite there...
D cai's hinder power for short cold drives, say back and forth to work in the winter?