Power Duals head pipes have set the standard for high style on late model baggers with its contoured collector shield, crowned with the iconic Vance & Hines v-twin crest. Now, that exquisite style gets a fresh injection of greater performance thanks to innovative PCX™ Technology, which utilizes chambered high-flow catalysts combined with stepped headers to increase mid-range torque for more responsive acceleration off the line and positioned downstream to optimize rider comfort PCX™ (Power Chamber Exhaust) Technology Chambered high-flow catalyst cartridge designed to increase torque Catalysts repositioned downstream for rider comfort. Works with most aftermarket slip on mufflers.