09-13 HARLEY XL883N: Vance & Hines Q-Series Double Barrel Exhaust (CHROME) The Double Barrel system gives you a great rumble and provides better performance over stock. Double Barrels have a larger Power Chamber for more horsepower and torque in the mid-range and better ridability. With full-coverage heat shields, the system will look great for miles.Power Chamber Crossover Technology.Full coverage heat shields.Available in chrome finish.Equipped with O2 sensor ports.Note: Vance & Hines recommends installing a Vance & Hines Fuelpak