Smaller than OEM, I had to cut off one of the welded rods so I could fit the rubber mount. I could weld better than on the muffler. It fits well. I will never understand why mufflers are sold without bolts, nuts and gaskets for their flanges. It makes absolutely no sense as there is no way to reuse the old ones. July 2017 (3.2 years later) I have to replace the muffler again. My stainless steel rear silencer .s!