Used Correct Craft Ski Nautique/ Centek fiberglass muffler 1600813. This muffler measures approximately 29” overall in width and 8” in diameter. there are (2) 3 1/2” inlets spaced approximately 23 3/4” on center and (1) 4” outlet. This item was removed from a boat many years ago and placed in storage. There is no damage or cracks and it appears to have seen very litle use.