There are several routes to gain more power, and each has its own pros and cons. Some can gain you MPG, some won't. It all comes down to your intended use, wether it be towing, sledpulling, racing or just an all-around fun truck. Like KVic said, fill out you sig so we know what you have then figure out how you are going to use your truck then let the questions fly. There are ALOT of people on here with ALOT of experience with the Cummins engines, I can almost guarantee someone here can answer any question you have. Good Luck and welcome to TDR.