Thoroughly tested ASM design header / exhaust manifold. The 4-2-1 exhaust manifold fits everything from normal F20C to ASM 2.2L engine. Exclusive reinforcement brackets on flange and reinforcement plates on pipe joints were added for improved durability. Features improved torque and power in all rpm ranges, and unique design that allows greater ground clearance, without adversely affecting performance.
An improved model of the exhaust manifold 04, which is an improved version of the 04 model based on the latest test data. The top-end power keeps the same or higher while enriching the low-speed torque. The definitive version of the exhaust manifold that has both ease of riding and speed.