Using these DeatschWerks fuel injectors and rails is easy. First, make sure your vehicle is turned off and the engine is cool. Remove the old fuel rail and injectors carefully. Then, install the new 750cc injectors and the top - feed fuel rails in their place. The 100% drop - in feature means it should fit right in without any major modifications. When it comes to fuel, since the parts are fully anodized, they're compatible with e85 fuel. However, always check your vehicle's compatibility with e85 too. For maintenance, it's a good idea to have your fuel system checked regularly, especially if you notice any changes in performance. And remember, if you ever need a different flow rate, there are 850cc, 1000cc, 1200cc, and 1500cc injectors available.