You can, I did for a short time. There is nothing in the documentation for the Bully Dog Triple Dog downloader that says it removes or modifies speed or rev limiter for Dodge Cummins trucks that I saw. I won't use the BD Triple Dog downloader any longer. Just not comfortable with my experiences with it. There are other options available that do claim to remove speed and rev limiter for the 04. 5 and up Dodge Cummins trucks, and some new to be soon released if the information in the forum threads are correct. Do a search and you should find more information.