Originally Posted by cabinetmaker
Read the reviews on your link and noticed this:
Question: Can this be attached directly on to the muffler??
Answer: You can but do not use on RV. RVs seem to create more exhaust heat than normal. I put one on and it burned the lining of the rap. Did not work for me. Took it off
I did 30 seconds of searching to find that. If that particular one ain't perfect, find one that is designed for your specific application. They exist, aren't that expensive and generally easy to install.
If the OP thinks hot water is a problem, I can top that. My KTM dirt bike motor liked to boil the fuel in the fuel tank when ridden in warm/hot weather. You would think the bike manufacturer would have that figured out by now, right? I wound up finding some adhesive backed, volcanic rock coated film to use for my issue. Worked fine, no more boiling fuel.