Cobra Race-Pro Slip-On Mufflers - 4-1/2" - Chrome - FL169363614 Product Description Bodies taper to 4" round at the front 4 1 2" machined aluminum thin line black tips are held in place with seven stainless steel 12 point bolts Features satin black laser cut steel straps that tightly encircle the mufflers with built in mounting straps 3" cores for superior performance The frequency and location of the perforation patterns in the cores create a significant sound scattering in the mid frequencies, which