Universal muffler. Reversible design. ProXSª Muffler 2.5" Offset Inlet/ 2.5" Center Outlet, 4" x 9.5"" Oval, 19" Long Body, 24" Overall Length. Un-Notched necks are designed for weld in installation. If clamping, use 3" wide band clamps 18004. Alternate muffler with notched necks is 400484. Use 1" wide band clamps 18325. See below for additional Product Features & Benefits