Using these fuel injectors is easy. Just make sure your vehicle model is one of the compatible ones (2002 - 2014 WRX, 2007 - 2017 STI, 2007 - 2012 Legacy GT). The injectors are designed for a 100% drop - in installation, so you won't have to do a lot of modifications. When it comes to using e85 fuel, the fully anodized in and out design ensures the injectors can handle it well. As for maintenance, it's a good idea to check the -6 AN connections regularly to make sure there are no leaks. Also, if you want to upgrade to a different cc size later (850cc, 1000cc, 1200cc, or 1500cc are available), you can do so. Just follow the normal installation procedures for replacement.
