Buteos: Every installation creates own problems. There are a lot of variables such as, how restrictive the muffler is that you are using, how much escape do you have for the exhaust flow. those things have a bearing how much temperature you'll have. In my case, my muffler was touching the cowl very loosely, but I had no problems. I wish there was a simple answer but there isn't. Good luck with your dilemma.