Horsepower
 

I was looking at the Dodge.com site and it shows, in the "build your own" section, that the hp rating of the non MDS engine(manual trans) is 383. I think thats an improvement, I think I saw earlier ratings at 370/375.

Nice. There has been persistent speculation that the 5.7 was underrated so as not to encroach on the 6.1. Perhaps w/ the advent of the 6.4 some of those extra horses have been 'found'.