Powerport Dual Headpipes with Dual Bungs - BlackPowerPort Dual Headpipes make use of Cobra's strategically located PowerPort cross over to deliver 2 into 1 power with the look of a traditional dual system. Fattens the low end and mid range torque curve; perfect for touring and highway use. Includes headpipes, PowerPort cross under section, heat shields and all of the mounting hardware needed. Offers both 12mm and 18mm bungs in the stock location. Mufflers not included.