Drop the hammer, get pinned to your seat. The Mercury Pro XS family of four-cylinder outboards delivers performance you can feel. With the largest displacement and best power-to-weight ratio in its class, the Pro XS outboard produces unparalleled torque, acceleration and high-rpm muscle. Whether running compact bass rigs, flats skiffs or multi-species boats – on freshwater or saltwater – the Mercury Pro XS is unmatched muscle for midsize boats.