im not really sure and i think im sayin the same stuff as every one else but i own an 03 7.3 and my buddy owns an 03 6.0 and i know i would double for my 7.3 if i had to choose between mine and his. hes been through 3 sets of heads 2 turbos he has had probs with the injectors end the electronis. hes got 15k miles mines got 85k and ive never had a single prob and drive the f#*%ing piss outa my truck