04-08 KAWASAKI VN1600B: Vance & Hines Big Shots Staggered Exhaust (Chrome) To get your V-twin the deep big twin rumble it should have, Big Shots are the answer. Maintain the intimidating look of a 2-into-2 system while achieving the performance advantages that come with a 2-into-1 system, Big Shots feature the hidden crossover appropriately named the Power Chamber. The Power Chamber uses the volume of both mufflers to increase horsepower and torque, and with 2-1/2" head pipe heat shields and oversized 3" muffler bodies, when you twist the throttle you'll wonder if it is even the same motorcycle. Big Shots are a 100&#176; blue-proof system to harness the full potential of this model. Power Chamber Crossover Technology.