Mufflers Tf R Black Flh 16Tri Flo Slip On MufflersTri oval shaped muffler rear seamlessly transforms into 4" round front 5" wide, 4" tall thin line aluminum tip 3" core for superior performance Acoustical engineering developments allow an incredibly deep sound because of intense, class leading resonance absorption and prevention Feature proprietary materials with specific acoustical dampening and thermal insulation properties The frequency and location of the perforation