Here, you are looking at the Tomei Expreme Equal Length Exhaust Manifold Kit for the 15+ Subaru WRX. This exhaust manifold is the result of 4 years worth of research and development to provide you with a quality manifold. Tomei discovered all the design flaws associated with the OEM manifold and created a quality replacement that will improve the power and the performance while saving weight and producing an aggressive exhaust note. DETAILS: Equal length layout SUS 304 stainless steel construction 2mm piping thickness. Creates an aggressive exhaust note. The design removes all the multiple narrow restrictions found in the OEM manifold. Larger turbo side port ID on the flange compared to stock. Saves weight. Improves both horsepower and torque. Reduced turbo spool time and improved throttle response Includes new gaskets.