My muffler has a leak from the pipe which goes to the exhaust manifold. After researching the issue, it would appear that trying to fix the problem is often a futile effort and replacing the muffler and using a hump hose is recommended. Looking at Catalina Direct they have the muffler but there are dire warnings that one should use a muffler with a the original design, otherwise, an after market muffler will allow water into the engine. Looking at various Vetus mufflers I fail to see a difference other than one of substantial difference in cost. Has anybody used an aftermarket muffler and if so do you know the make and model? Can anybody enlighten me as to the validity of Catalina Direct's claim? Thanks.