Using this Remark axle back exhaust is easy. First, make sure your car is a 2011 - 2014 Subaru WRX or STI sedan, as it won't fit other models or aftermarket exhaust systems. You can directly bolt it onto the OEM mid Y - pipe with the included gaskets and bolts. No complex modifications are needed. When driving, you'll enjoy a more powerful and distinct Subie sound, along with increased power and torque. For maintenance, regularly check the bolts to make sure they're tight. If the exhaust gets dirty, you can clean it with a mild stainless - steel cleaner. Keep it dry to prevent rust. This will help your exhaust last longer and perform at its best.