We need a little more information. First off, is the truck N/A (stock) or turbo'ed? That is probably the biggest factor. dps-performance.com is the only place that sells upgraded injectors, but I've heard bad things about them, that they flow well but the spray pattern is horrible, which results in lots of smoke, but very bad fuel economy. I would only recomend those for a turbo'ed truck. If I was him, I would buy a set of new G code injectors, they came on the factory turbo'ed IDI's and are the best injector right now IMHO, they came on the 93-94 turbo 7.3 IDI. I heard you could get new moddified tips for injectors, nobodies ever done it, and it would run $600+.