Definitely DON'T buy remanned injectors. I bought some from and had them installed by a reputable diesel shop on my 04.5 Cummins. Within 7k miles I started having problems. They pulled them out and sent them back to the place that had rebuilt them. Truck was down for a week, within another 5k miles more problems. Took the truck to the aforementioned injection "experts" and paid them to rebuild/recalibrate them. Still had issues. After 4 trips to the two different shops it was still never right. No way I would ever buy anything other than OEM new injectors. Even at that, ridiculous that they don't last more than 120k-150k miles. The whole reason my new truck is a gas motor. Miss the diesel torque, but not the repair bills and hassles.