i would say 03-05 on the 5.9s or 09 and newer for the 6.7

 

04.5- early 07 with a 5.9 i would stay away from the 6.7 imo

 

I can hardly find a 09 around here

 

There is nothing really wrong with a 07.5-08 6.7; you just need to delete them or problems will occur, IMO you need to delete any 6.7. I love the 6.7s they are nothing more than a bored over 5.9 when deleted. My next truck will be a 6.7!

 

So a late model 07,08,09 are all the same?