This 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 response. 

HIGHLIGHTS:

High-efficiency 4-1 type

Unequal-length layout

Increase in piping diameter with smooth bends

Produces an aggressive Subaru rumble

Lightweight 

SUS 304 stainless steel materials

Includes new gaskets, hardware, exhaust wrap, and stainless-steel zip ties take this manifold ready for the installation