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RAM Clutches 28556 Circle Track Series Coupler still reigns supreme as the smallest, lightest clutching device on the market. This Coupler is ideal for use in lighter weight cars that have limited on-track shifting. The Coupler is precision designed to provide a quick deceleration into turns, and a faster acceleration out of turns thereby maximizing the engine’s potential. The Circle Track Series Coupler has been expertly engineered and designed for use with a Standard Flex-plate. RAM Clutches are the Champions Choice.