Using the Remark Axleback Exhaust is easy. First, make sure your car is a 2011 - 2014 Subaru WRX or STI Sedan as it won't fit aftermarket exhaust systems. The exhaust comes with all the necessary gaskets and bolts. Simply bolt it directly onto the OEM mid Y - pipe. It's a direct - fit installation, so you don't need to make any major modifications. While using it, you'll notice an increase in power, torque, and a more pronounced Subie sound. For maintenance, regularly check the bolts to ensure they are tight. Clean the stainless - steel parts with a mild stainless - steel cleaner to keep it looking great. Avoid using abrasive materials that could scratch the surface.