Monster Black Expansion Chamber Muffler-2 Stroke Engine Gas Motorized Bicycle.
48cc/50cc/66cc/80cc RUNFAST TM muffler Black - 2 stroke gas motor engine kit- Gas Motorized Bicycle
RUNFAST NASTY JACK muffler fitting on 2 stroke gas motor engine kit gas motorized bicycle;
RUNFAST NASTY JACK muffler fit on well on most cylinder heads including CNC head;
Black color with better performance and cool shape;
Size of Air Outlet: 0.984 inch outside diameter and 0.886 inch inner diameter;