Using this ETS cat - back exhaust is easy. First, make sure you have all the necessary hardware included in the package. If you're using a stock downpipe, don't forget to get the GrimmSpeed adapter. Then, install the exhaust following the included instructions. It's designed to fit your 2002 - 2007 Subaru WRX or STI nicely. As for maintenance, you can clean the exhaust tip regularly with a mild cleaner to keep it looking good. Check the V - band connection and bolts periodically to make sure they're tight. If you notice any unusual noises or leaks, have it checked right away. With its lifetime warranty, you can have peace of mind while using this exhaust.