Feature the revolutionary Power ChamberÖ design; a unique cross-over system that increases horsepower and torque Armed with full-coverage 2-1/2" heat shields that are essentially blue-proof for long-lasting style Like all Vance & Hines systems, these feature a superior fit and an unrivaled finish Incorporates a new, revolutionary "Super Bung" dual mounting O? sensor port allowing oxygen sensors mounting for 12mm and 18mm installation in a single V&H exhaust system Meticulously finished slash-cut billet end caps Removable baffles, and all mounting hardware included Made in the U.S.A.. BIGSHOT STAGGRD 91-05DYNA