Tomei Expreme Unequal Length Exhaust Manifold 2002-2014 WRX / 2004-2021 STIThis is the Tomei Expreme Unequal Length Exhaust Manifold. This is a direct replacement for your factory exhaust manifold to save weight, improve the exhaust flow while producing an aggressive sound and provide an increase in both horsepower and torque. This exhaust manifold is a great way to really improve the response from your turbocharger from stock to aftermarket as the response and flow will be optimized for decreased spool times, and a faster