Tri-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 patterns in the cores creates significant sound scattering in the mid frequencies, which helps to enhance the low frequency tones. Made in the U.S.A..