Using this Remark axle back exhaust is easy. First, make sure your vehicle is a 2011 - 2014 Subaru WRX or STI Sedan, as it won't fit aftermarket exhaust systems. You can directly bolt it on to the OEM mid Y - pipe with the included gaskets and bolts. When driving, enjoy the increased power, torque, and the cool Subie sound. As for maintenance, regularly check the tig - welded joints to make sure they're in good condition. Keep the stainless - steel parts clean to prevent rust. If you notice any strange noises or looseness, it's a good idea to have it inspected right away.