Step up your H-D Touring performance with Rinehart's 2-into-1 exhaust system as the stepped header allows for a significant increase across the ranges especially within the low and mid-range. The 2-into-1 system retains a classic and sleek look that never goes out of style while giving you the Rinehart sound that has been known and loved by many. Stepped header technology Progressively expanding chambers scavenge the exhaust, drawing it out of the cylinder, allowing the engine to operate at peak performance to make the most horsepower Best of both worlds - stepped header 2:1 system provides the rider with powerful low end torque and maximum top end horsepower This power system is wrapped up with precision laser cut heat shields and a smooth collector heat shield Classic, sleek look that packs a punch of performance Features 12mm & 18mm 02 ports, with optimum placement for dyno tuning and proper measurement of the exhaust gas concentration from the port, making the engine perform efficiently