Heck with these emission tunes.. ****** it and be done.. you're wife will be fine with it- just respect the added horsepower. These 6.7's are not powerful enough to wreck unless you just flat put can't drive lol seriously though, i believe you will have issues in the long run leaving the emissions on... esp with tuning.
As far as epa. I am in a liberal state and i do alot of work for the highway administration, i asked them constantly about them cracking down on this subject.. they laughed and said not to worry
Fwiw also, there is a 6.7 local to me who ******d his when he bought it new.. drives everyday and tows, now has just shy of 400k miles eith no issues other than maintenance.. no way will these truck last like this with emissions. I could be wrong but with so much electronic mess in the system spells issues.