I was thinking about upgrading my duramax efilive to get cummins support too. I have a couple friends that want it done and was gonna get some tunes from Rob for the Cummins. I was wondering what can I expect from the cummins tuning? I know more power but does it run alot smoother, better mileage and less smoke? And also what is the max hp the cummins trans will hold? And what would be the max power if they do use it for towing? Thanks guys/gals.