Using this exhaust system is straightforward. First, gather all the parts from the package, including the exhaust manifold, up pipe, turbo gaskets, exhaust wrap, and hardware kits. Before installation, make sure your vehicle is turned off and cooled down. Remove the old exhaust parts carefully and replace them with the new ones. Use the provided hardware to secure the components tightly. For 02 - 05 WRX models, check if you need to install a 2.5l STI oil pan. For 06 - 07 WRX models, install the STI oil cooler and STI oil pan as required. After installation, start your vehicle and check for any unusual noises or leaks. To maintain this product, regularly inspect the exhaust system for signs of damage or loose connections. Keep it clean by wiping it down with a mild cleaner. If you notice any issues, such as air leakage or a decrease in performance, it's best to have it checked by a professional.