Hi im new to owning a Cummins and working on one I am looking to do some upgrades I want to be around 500 to 550 hp I have a 2003 dodge 2500 Cummins with what I believe to be a HO but am still looking into it for sure my truck has 147000 miles on it and its a 6 speed I currently have a bully dog torque dog on the truck and 4 in exhaust. What would be the best upgrades to achieve my goal if I build more power than 550 it wont hurt my feelings im just looking to keep it a daily driver.

 

one of the upgrades i would recomend is for the fuel system to keep fuel going to the pump so it don't burn up. It won't add hp but it will save your fuel pump from seizing.
Then i would recomend a open air filter setup.

 

clutch kit, Lift pump, edge cts juice with attitude, Industrial injection bag of parts or arson cp3 upgrade, 125hp injector nozzles, 64 or 66 mm turbo, exhaust and intake... that should give you the boost you're looking for.

Enjoy