So I've been moseying along with my underside motorhome sound deadening. I have bought a lot of DEI Tunnel Shield II. ****s like $15/sqft. I have a little more to do around the engine, then I'm going to do the heat shield above the muffler and call it good.
I started it today to get it hot so I can re-stick anything that changed shape and add a couple more clamps to the muffler blanket now that the aluminum relaxed a little bit.
My arms are tired, need to go re-roller the Dynamat in place with the flooring roller.
I noticed that I can no longer hear the exhaust or engine through the floor at idle. It all comes through the windshield now. So, with that, I might skip the header wrap unless by chance the exhaust overpowers the whine of the reaction shell in the transmission at speed. I don't think it will. However, I might add some more interior sound deadening if I decide to make the cabin floor the same height as the coach floor.