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Sound Abatement? The routing of the exhaust starts with a 2" thickwall from the engine thru the wall and into the concrete blocks, then down one side to the bottom block, then back up the other side and then thru the 4' thickwall to the outside. You can hear it thump inside the house. The webbing has been knocked out of the bottom block so that exhaust can pass to the other side. The exhaust has a nice thump to it, and not noisy at all. Most of the noise is from the air intake on the outside. It is an Air Cleaner assembly off a 305 GM. This sits under the 'Doghouse' that you see in the photo. This doghouse eliminates some of the noise. I want to be able to hear it run when I am inside the house.