why dont you just get a 2009-2010 6.4? their the best years to get a 6.4 and a 6.4 is reliable, even more so if you looking to do a DPF delete and tuning. only down fall of the 6.4 is your MPG
wont be as good. if you DPF delete, tuning, intake,exhaust... your looking like 14-15 city / 18-19 hwy at best.