Rubberized Bushing for the Exhaust Support on Rotax Max Evo Kart Engines. Made of a high-temp resistant rubber, these bushings cushion the Max Evo exhaust during operation of the engine, and are a wear item to replace over time on the kart.
This is noted as part (11) on the diagram. Typically the support plate utilizes (2) of these support bushings to hold the exhaust in place.