Exhaust Manifold is the key to the 86/BRZ power upgrade. The stock manifold has the catalyzer which prevents from better performance. But HKS catalyzer can provide more power because of the less resistance and better cleaning exhaust which passed the Japanese gas
Manifold part is designed of 4-2-1 layout design that has better performance. And for the catalyzer part, HKS put more catalyzer metals which change the cleaning ability. So itís smaller and powerful that passed the regulation.
It has more power because of the 4-2-1 layout design. It has less exhaust resistance so that has more power for the normal range to high RPM.
Itís more comfortable driving experience because of the better performance at a normal range acceleration. And also at the high RPM itís better feeling stock and fun to drive fast in the NA.
Itís made of SUS304 so that it can also be used for circuit.
Not adaptable for AT. Itís combined unit of manifold and no. 1 catalyzer. No. 2(front pipe) is stock. * O2 sensor must be moved.