Using this Tomei cat - back exhaust is easy. First, make sure your car is a 2008 - 2014 Subaru STI Hatchback or 2011 - 2014 Subaru WRX Hatchback. Then, carefully install the exhaust following the included instructions. If your car has the factory downpipe or J - pipe, remember to get an adapter from GrimmSpeed. As for maintenance, regularly check the exhaust for any signs of damage or loose parts. You can clean it with a mild soap and water solution to keep it looking good. When starting the car with this exhaust, enjoy the great sound it makes, but be aware that it might draw some attention.