G'day crumpet, Scouring pads aren't going to do much in the way of noise attenuation. Stainless steel wool is sometimes used for this, though.
I've both built and re-packed motorcycle mufflers, and used glass fibre mat packing - readily available through the motorcycle trade.
Are you thinking of packing an existing muffler, or building one from scratch?
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
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