resed.........................I have used the plumber's teflon tape around the threads, just one layer only try not to overlap. I do it to both ends, being careful not to get close to the engines outlet. This area gets pretty hot. It will seal in. I also use two wrenches when tightening the nuts. I've lost my first Saito muffler when I switched to 4 strokes. After that I started to use the teflon. Its been working pretty good since. With the heat the teflon softens and seals. It is also easy to remove, better than loctite (blue of course). I was replacing our kitchen faucet one day, where I had to use teflon............Bingo....I figured I can use this on my Saitos mufflers.

Charles.

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