Exactly what I thought, wouldn't want to mess with anything like that. However I would get an ECU tune if one happens to come to market.Messing with anything on that truck is playing with fire, especially for the 1st couple of years. Nissan isn't going to tolerate mods.
No, it doesn't HAVE to do anything.I hear you but it has to do something. It gets rid of the huge muffler behind the DEF. so it will be straight pipe from the DEF.