Cobra Power Pro HD 2 Into 1 Exhaust for 2006-2011 Dyna models - One Size New design with a sleek cylindrical muffler body in addition to the megaphone style of the original Power Pro Lustrously chromed 3-3/4in. muffler body with a delicately machined chromed billet tip Full-length heat shield coverage Internal cooling technology for non-blueing muffler body Double-insulated body