These exhaust manifolds make for an excellent upgrade because they save weight, and are designed with less restriction to improve the power and performance.
This manifold is perfect for those of you on the quest to make more horsepower, more torque, and to get that all new boxer sound.
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.
Note: May not fit some Forester, Outback, and Legacy models with the OEM oil cooler.