Tomei Expreme Equal Length Exhaust Manifold - Subaru STI VA
Tomei designed the headers to be the 4-2-1 layout with 42.7mm, 45mm, 60mm sizes to help extract the absolute maximum from your EJ25 turbine with the equal length design. The exhaust pressure is controlled best by this layout and you can see the peak power gains at high RPM.
The lost wax process was used to eliminate cracking from welded weak points and for aiding smooth exhaust gas flow with out any interference.You will have a new higher pitched racing sound from the isometric design. With 2.5mm thick pipes made from SUS304 Stainless Steel.