Ego has nothing to do with anything. TO get rid of all the emission crap, It has to be programmed to get rid of codes.I have had diesels for awhile and always had a reputable EFI tuner sit in my truck and tune it .And not all programmers are equal.some will stress a motor out.
If I can delete my emissions to put a larger exhaust to lower my egts and gain mpg with a turbo brake and performance has nothing to do with ego.
It doesnt matter if it has a programmer on it if the guy beats the******out of it its been stressed out