I recently got to spend a day with a 2015 Scat Pack RT with the 6.4 and it made my 5.7 feel slow! Only problem is I don't think I can quite afford a 2015+ model. Will the 2011-2014 SRT8's with the 6.4 feel just as fast as the 2015 and newer models? I know there is a 15 HP difference and I won't get the nice active exhaust, but I need that engine! Any help is appreciated!