Catalytic convertor for Yasuni SCOOTER 4 4-stroke exhaust systems. Compatible with the following Yasuni exhaust systems: YA354, YA355, YA356, YA451, YA452, YA453, YA454, YA654, YA656, YA657, YA711, YA712, YA1200, YAYA1201, YA1202, YA1203, YA1204 and YA1206.