Using your Remark sports touring cat back exhaust is straightforward. Simply bolt it on to your 2015 - 2021 Subaru WRX or STI following the provided instructions. As you drive, enjoy the rich, powerful sound it produces. When it comes to maintenance, regularly check the exhaust for any signs of damage or loose bolts. Clean the exhaust tips with a mild stainless - steel cleaner to keep the burnt finish looking great. Avoid using abrasive materials that could scratch the surface. If you notice any rattling or changes in the exhaust note, it might be a sign to check for loose parts. Keep it in a dry place when not in use to prevent rusting.