RVman3252 wrote:
The dealer said it will improve fuel mileage, increase horsepower and decrease maintenance...
That is all true. It is however an EPA violation. If you are in a position where you might make somebody else really unhappy (i.e. you are an employer, or even a landlord) your chances of being reported go way up, as do the potential fines (EPA has the option to issue an income-based fine for businesses).
Also.... dealers are not supposed to do any warranty work if the system is not intact. Even worse... to drive the truck after doing a delete, you have to run a programmer and Cummins considers that grounds to terminate your engine warranty.
So... weigh the risks and benefits carefully.