The Vance & Hines Pro Pipe is the ultimate in performance for your Harley-Davidson big twin, period. With over twenty years of evolution, Pro Pipe, has all the ingredients for making power; stepped headers, an oversized collector and long megaphone muffler. The latest generation Pro Pipe now features our innovative PCX™ technology, which integrates a chambered high-flow catalyst in the megaphone for a bigger boost in torque and the boneshaking roar of a drag bike racing down the strip.