Using this MBRP Armor Pro 3in Cat Back Exhaust is easy. First, follow the included installation instructions for a bolt - on installation. It's designed to fit your 2011 - 2021 Subaru WRX or STI Sedan. Once installed, you'll notice a moderate exhaust tone and an increase in power. When it comes to maintenance, since it's made of 304 stainless steel, it can resist damage from snow and salt. But it's still a good idea to clean it regularly with a mild soap and water solution. Avoid using abrasive cleaners that could scratch the surface. Also, check the bolts periodically to make sure they're tight. If you have any issues, remember that the exhaust comes with a lifetime manufacturer warranty.