Using this exhaust header and up - pipe set is straightforward. First, make sure to check if your Subaru WRX or STI model year requires any additional parts like the oil pan or oil cooler as noted. Then, carefully install the exhaust manifold, up - pipe, and other included components following standard automotive installation procedures. When using the exhaust wrap, wrap it around the exhaust parts for better heat management. For maintenance, regularly check the connections and gaskets for any signs of wear or looseness. Clean the stainless - steel parts with a mild automotive cleaner to keep them in good condition. If you notice any air leakage or unusual noises, inspect the 3 - bolt flange and slip - joint bracket immediately.