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Forged Pistons (4)
740902-0016 = 1
21 φ88 2301-RT042
5" diameter and overall discharge area is increased by 100%
- 2618 T6 high tensile forged aluminum
HKS STAINLESS STEEL EXHAUST MANIFOLD 2013+ FR-S (ZN6) Universal Forged Pistons (4)Product Manual 33002 BT001 Fits: 2013+ FR S (ZN6) Size : 42. 7mm 50. 8mm 60mm Style: 4 2 1 FEATURE The Stock exhaust manifold was designed by the 4 2 1 type layout for a better performance for a lower engine speed torque. Because the first catalyzer is mounted at the exhaust manifold, exhaust pulsatory motion makes the exhaust gas to pull back to the pipe at middle RPM range. It causes a loss of output by behaving as an exhaust gas recirculation. The
