I wrapped the pipes with a heavy fiberglass blanket, taped it with 4" fiberglass tape and then smeared a mastic on it. My question is did I do it right? The wall next to the muffler got r-13 insulation and the a 1/4" piece of concrete board. The temperature before the wrap was about 165 degrees. The engine temp was about 165 and I put my hand on the muffler and I could leave it there. Not very hot at all.
Last edited: