Using this Remark R1 - Spec cat back exhaust is easy. First, make sure your vehicle is the right model (2008 - 2014 Subaru STI Hatchback or 2011 - 2014 Subaru WRX Hatchback). The exhaust comes with all the necessary gaskets and bolts for a direct bolt - on installation. Just follow the instructions carefully. When it comes to maintenance, regularly check the connections to ensure they are tight. You can also clean the exhaust with a mild stainless - steel cleaner to keep it looking good. Remember, using exhaust hangers is recommended as it will make the exhaust fit tighter to your vehicle. Enjoy the increased power, torque, and the great sound this exhaust brings to your car!