HKS Stainless Steel Header for Subaru BRZ, Scion FRS

HKS Exhaust Manifold- 13+ Subaru BRZ & Scion FR-S The stock exhaust manifold follows a 4-2-1 design layout for better performance and a lower engine speed torque. Because the first catalytic converter is mounted at the exhaust manifold, exhaust pulse motions make the exhaust gases pull back at the middle RPM range which causes a loss of output. The HKS Equal length Exhaust Manifold follows the same 4-2-1 layout but without the catalytic converter. This allows for both more torque at mid RPM and higher horsepower for higher RPM. Each manifold is made from SUS304 grade stainless steel and mandrel bent for the best of quality and durability.