I own a 6.0 and love it but my buddy wants to buy a 6.4 and wants it to be reliable. I told him to start with a dpf delete. What I don't know is do you have to have a tuner to turn off the regen cycle even though you delete and put in the replacement pipe? Also on the pipes, with or without bungs? I assume the bungs are to hook the sensors back up to the new pipe. Thanks for the info guys.