Its possible. I was just going off of what he said about having plenty of fuel, and assuming that meant plenty of black smoke. It could be the the turbo is to small. I have the same turbo with a very similiar setup except I have larger injectors and don't have the same issue. Thats why I was suspecting a boost leak somewhere, but each truck is a little different. I am still suspect of the comp personnaly and would advise to try another one if he knows somebody with one, before trying another turbo, unless he happens to know somebody with another one of those also.