Cobra Chrome Race-Pro 4 1/2 in. Slip-On Mufflers 2017 Harley-Davidson Baggers. 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. Acoustical engineering developments allow an incredibly deep sound because of intense, class-leading resonance absorption and prevention. Use proprietary materials with specific acoustical dampening and thermal insulation properties. Sold in pairs
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