Well alrighty then I might be older and a Industral mechanic but I can tell you taht it is very easy to clean off the copper gasket and put the muffler back on using the the copper sealant gasket then it is to make a new gasket everytime you need to pull the muffler off the engine. How hard is it to spread the gasket sealant on thin with your finger and locktite your screws. It sure gives me peace of mind not having to worry about the muffler failing. My two cents. 62 and nothing falls out that I do'nt want to.