Delivering the best of both worlds; radical custom-bike styling with high quality details like precision-cut full coverage heat shields; Big Radius reset the bar for aftermarket exhaust systems. Now featuring innovative PCX™ Technology; which integrates chambered high-flow catalysts for a boost in torque while producing the deep throaty growl you want from your V-Twin machine. - PCX™ (Power Chamber Exhaust) technology - Chambered high-flow catalyst cartridge designed to increase torque - Full coverage heat shields. Vance & Hines innovative PCX™ Technology: More Power & Less Heat. The PCX™ (Power Chamber Exhaust) Technology are factually chambered high-flow catalysts. Used to increase mid-range torque for more responsive acceleration off the line. They are positioned downstream for up to 20% less heat at the floorboards / footpegs and 50% less heat at the collector; to optimize rider comfort over the stock system.