Samson Exhaust is proud to introduce their new Powerflow III for the 2012 Harley-Davidson Dyna Switchback. This powerful two-into-one exhaust generates power through a series of chambers, which help condense and intensify exhaust flow, resulting in extremely high horsepower and torque. Independent dyno testing has shown that by just changing out the stock pipes with this new Powerflow III two-into-one system, riders will experience up to a 20 percent increase in both horsepower and torque.