Using this Invidia Q300 exhaust is easy. First, make sure your vehicle is the 2015 - 2021 Subaru WRX or WRX STI. Since the exhaust hangers are welded onto OEM locations, it should fit directly. Just attach the new gaskets and hardware that come with it. If you have the factory downpipe, don't forget to use the required adapter. When it comes to maintenance, regularly check the gaskets and hardware for any signs of wear. You can clean the stainless - steel parts with a mild soap and water solution. Avoid using abrasive cleaners as they can scratch the surface. And remember, if you hear any strange noises or notice a change in performance, it's a good idea to have it checked out.