13. The Rinehart 2-into-1 yielded better horsepower results than the true duals. Before the Rinehart installation the Road King produced 68 hp and 83 lb-ft torque with the duals. After the Rinehart exhaust was installed the bike produced 75 hp but stayed the same at 83 lb-ft of torque. Also, with the 2-into-1 the Road King seems to accelerate more smoothly throughout the powerband.