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Homemade exhaust for your old lawnmower

Step 2Assemble the manifold

Assemble the manifold
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The manifold (Part of the muffler that attaches to the engine block) is easy to make from a threaded nipple, a hex bushing and a 90 degree elbow.

Assemble these parts tightly. Depending on the final required orientation of the muffler, it may be necessary to attach some parts with a bit of fiberglass tape to allow more flexible positioning of the joints. Here, I used fiberglass cloth left over from a canoe pontoon project, but you could also use fiberglass drywall tape. You might not require the fiberglass at all. I didn't use plumbers tape because I was concerned about the heat generated by the muffler burning the tape and causing a stink.
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Author:millenniumtree