Using this TurboXS axleback exhaust is straightforward. First, make sure your vehicle is a 2002 - 2007 Subaru WRX or 2004 - 2007 Subaru STI. Then, depending on whether you have an OEM midpipe or a TurboXS midpipe, use the unique flange design to bolt the exhaust directly to it. If you need the Turbo XS 4 - Bolt 3 - inch Gasket, you can buy it separately. When operating your vehicle, avoid breathing in the exhaust to minimize exposure to harmful chemicals. Only idle the engine when necessary. For servicing, do it in a well - ventilated area. Wear gloves or wash your hands frequently to keep yourself safe. To maintain the exhaust, check the bolts regularly to ensure they are tight. If you notice any unusual noises or performance issues, have it inspected by a professional.