A big thanks to 44boyd for taking the time to measure the inlet size for me before installation. These mufflers will actually work on my existing UFO headers as the inlet on the Delkevic cans are 2". The current old style mufflers have rivets that are beginning to work loose, wallowing out the holes. I could disassemble them, cut a little shorter and drill new holes for new rivets, re-assemble. But I was leaning more toward the polished stainless look opposed to my current ones that are aluminum cans. This opens up my options greatly. Probably going to go with the shorty ovals. Suits my style and volume level.