This fiberglass muffler exploded and blew the end off! The owner of the boat suffered a badly bruised thigh from where the end collided with him in the process however this could have been much worse! We discovered that a part had come loose inside which may have been the cause of the problem. To access this area we cut open one of the other ports revealing a section of pipe that had dislodged. This was glued back in place and the port glassed up again. The missing end required a glass plate glued in place and then glassed over.