Using this Invidia Q300 Cat Back Exhaust is easy. First, make sure your vehicle is the 2015 - 2021 Subaru WRX or WRX STi. The exhaust hangers are already welded to the OEM locations, so it should fit right in. Just use the new gaskets and hardware provided during installation. As for the adapter, if you have the factory downpipe, don't forget to install it. When it comes to maintenance, since it's made of 304 stainless steel, it's quite durable. But you should still check it regularly for any signs of damage or loose parts. Clean it with a mild soap and water solution to keep it looking good. And if you notice any strange noises or performance issues, it's a good idea to have it checked by a professional.