What is required to do the DPF delete ? I saw a post about swaping some hoses around that sounds easy enough. Does a person need some kind of program to prevent codes or anything else ? Also same for EGR deleate what is needed to do that as far as parts and steps needed to go threw and is a program needed for that as well to prevent codes ? I live in Ca. and would need to be able to put back to stock for service so wanted to see if can be done easy enough to be able to switch back and forth. Havent bought truck yet but I am really leaning toward 6.7 and like what I have read as far as mpg getting better with mods. Thanks in advance and sorry for long post.