Using these injectors is straightforward. First, make sure your vehicle is a 2007.5 - 2018 Dodge Ram with a 6.7L Cummins engine. Then, replace the old injectors with these new ones following normal replacement procedures. Remember, the warranty only covers manufacturing and material defects. Cracks caused by high fuel pressure won't be covered, and high return flow after 12 months on performance injectors isn't covered either. Also, don't try to sell or use these injectors on licensed California vehicles. For maintenance, it's a good idea to keep an eye on the engine's performance. If you notice any changes like a decrease in power or an increase in fuel consumption, it might be time to check the injectors. Since they are assembled using OE procedures, you can follow the regular maintenance schedule for your vehicle to keep them in good shape.