Tri-Flo Mufflers - Vulcan 1700Uses a single exhaust port with a 3" core. Unbelievably deep sound and increased performance over the stock system. Tri oval shaped muffler rear seamlessly transforms into 4" round front. 5" wide, 4" tall thin line aluminum tip. 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