Using this fuel injector upgrade kit is easy. First, make sure your vehicle is turned off and cool. Remove the old fuel rail and injectors carefully. Then, simply drop in the new 1200cc injectors that come with the kit. Connect the - 6 AN in and out fittings properly. This kit is fully anodized to work well with e85 fuel, but always double - check your vehicle's fuel compatibility. When it comes to maintenance, regularly check the connections to make sure there are no leaks. Also, keep an eye on the performance of your engine. If you notice any issues, it might be time to have the injectors inspected. You can choose different injector sizes like 850cc, 1000cc, or 1500cc according to your vehicle's needs.