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Message: <blockquote data-quote="Tazza" data-source="post: 24551" data-attributes="member: 82">The powder is just carbon, nothing to worry about. I don't know how well the spark arrestor mufflers work. I ran a diesel once without even an exhaust manifold, there were no flames out the exhaust anyway, unlike a petrol engine does. I guess its there just to be sure.No reason you can't use steel, some times they use different metals so they don't rust together and lock in place.</blockquote>