cummins isx 2007 power upgrade

What's the CPL # and other specs, because It depends on other specs of the truck also. Rear end, tire size, speed you typically travel, all play a big factor.

 

Unless you know or the person loading the file knows what they are doing, then yes go to Cummins. Driving your truck with a mismatched or bad cal file will damage that motor.

 

If he deleted egr cummins and all truck dealers ar required to put in back in to original condition

 

This has not been my experience. My truck has been to a cummins shop. It had a full delete when it went in and still has the full delete when it came out. The mechanics actually helped me when i had a problem with the delete and they seem to know exactly what to do to fix it. They could care less if your running emissions or not.