Using this exhaust is easy. Just bolt it on following the included instructions, and it'll fit right onto your 2015 - 2021 Subaru WRX or STI. When you start your car, you'll notice the great sound it makes. For maintenance, check the connections regularly to make sure they're tight. Clean the exhaust tips with a mild stainless - steel cleaner to keep them looking shiny. Avoid driving through deep water as it might damage the internal parts. If you see any signs of rust or damage, have it checked by a professional mechanic.