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The I-Beam is a proven configuration that is very popular among the forced induction crowd
but does not manipulate the ECU manifold boost reference
This manifold completely replaces the factory failure prone and restrictive plastic manifold with a high-performance USA cast aluminum part that will look amazing
Exhaust manifold gaskets
Tomei Unequal Length Exhaust Manifold - Subaru WRX 2002-2014 / STi 2004-2021 (+Multiple Fitments) Subaru BRZ The I-Beam is a provenTomei introduced the high efficiency 4 1 as an alternative option opposed to the STD 4 2 1. The exhaust efficiency of the standard exhaust manifold is not perfect, and the Tomei 4 1 type exhaust manifold offers exceptional exhaust flow efficiency. The Tomei unequal length exhaust system retains the famous boxer rumble while increasing both horsepower and torque figures for your boxer engine powered Subaru. *Photos for marketing purposes only. Actual
