By using numerical control machining to achieve a large, 4mm opening for the throttle, the flow-pass area is increased by 16% and the inertial mass during the intake of air is reduced. Accordingly, peak power is increased by a factor of approximately 6 horsepower.
16400-GE8-020 for GE8RS,GE8(L15A engine)
16400-AP1-040 for AP1-100, AP1-110, AP1-120, AP1-130, AP1-135, AP1-200 (F20C engine)
16400-AP2-020 for AP2-100, AP2-110 (F22C engine)
16400-DC5-020 for EP3, DC5 (K20A engine)