PN-460020 – 4″ 409 STAINLESS STEEL HIGH FLOW – STRAIGHT THROUGH PERFORMANCE MUFFLER. PERFORATED CORE WRAPPED IN STAINLESS MESH AND FIBERGLASS. 4″ I.D. INLET X 4″ I.D. OUTLET. 20″ OVERALL LENGTH / 14″ BODY / 7″ CASE