Using this Revel Medallion Touring - S Cat Back Exhaust is easy. First, make sure your Subaru WRX or STI is from 2002 - 2007. If you have a stock j - pipe or downpipe, install the GrimmSpeed Subaru Stock DP to Aftermarket 3 in. Catback Adapter p/n 077046 before attaching the exhaust. Once installed, you're ready to enjoy improved performance and power without the excessive noise. As for maintenance, regularly check the exhaust hangers for any signs of wear or looseness. Clean the exhaust periodically with a mild stainless - steel cleaner to keep it looking good and prevent rust. And always drive safely and within the speed limits.