Cobra PowrFlo 4-1/2in. Slip-On Mufflers - Black - 6215RB

4.5 inch body tapers to 4 inch round at the front
4.5 inch machined aluminum, thin-line tip
3 inch high-flow core for superior performance
Acoustical engineering developments allow an incredibly deep sound because of intense, class-leading resonance absorption and prevention
Uses proprietary materials with specific acoustical dampening and thermal insulation properties
The frequency and location of the perforation patterns in the cores creates significant sound scattering in the mid frequencies, which helps to enhance the low frequency tones
Made in the USA with a limited lifetime warranty