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packing
I have nine motorcycles and three of them have Supertrapp mufflers that require repacking every couple of years. I've used fiberglass repack kits and they work but seem short lived. My latest attempt on my dual sport bike included trying out S.S. "brillo" pads. They are the type you use to scrub pots and pans in your kitchen sink. I got a case of 12 at a surplus store. They are shaped like a donut and I slipped them over the core in a stack. After stacking 6 or 7 of them I replaced the core back into the outer housing and bolted it back together. it was a bit louder than the fiberglass packing but I do expect it to last longer. Time will tell. It was a cheap and low effort fix.
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