Cobra Dual Bung Pro Chamber Headpipes For Harley Touring These head pipes are the definition of allowing your H-D Touring motorcycle to run more efficient, make more power, and minimize the heat produced versus the stock headpipes. Cobra has modified their famous PowerPort by enlarging it which allows a pulse chamber that increases exhaust scavenging to produce power that's expected. Features: Dual headpipes taken to a whole new level PowerPort crossover provides power boost across entire RPM range Features dual pipe styling with 2-into-1 performance 2-1/2 heat shields provide proportionality and seamless, unbroken flow Includes one 12mm oxygen sensor bung and one 18mm bung for aftermarket sensors Accepts stock mufflers that will slip-on easily Mufflers sold separately