Power Flo Mufflers for '95-'16 FL - Chrome4. 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