Ok. I might have to look into that. I have replaced it already, but maybe it still isn't right. I tried really putting some pressure on it, and I think I got it on tighter. Then I put a really tight zip tie around the base of it where it flexes to go over the plug. It feels really tight now. I will have to run it to tell though. Did your engine come with the new style muffler, or the old style. How many outlet pipes does it have?