ETS V2 MaxFlow Header Exhaust Manifold 2008-2014 WRX / 2004-2021 STI (2- Bolt)The wait is over! Extreme Turbo Systems is proud to release the new Subaru STI V2 MaxFlow Exhaust Header for the 2004+ Subaru STI. ETS designed the V2 MaxFlow Header to be a direct factory replacement header. They start off with large 1 7 8 primary runners that come together in a true low angle 4 1 merge collector that then flow into a huge 2. 5" secondary for maximum scavenging and exhaust flow. Features 1 7 8" primary runners with 2 1 2" secondary
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