How much muffller packing material do I need for an FMF Q Muffler?

Does anyone know how much Silent Sport packing material I need to repack a FMF Q muffler for a 2003 WR450F? They sell a 250g and 450g bag. I did a search on this but nobody said how much they used. Also, I know I could just buy a pre-cut FMF packing set but I want my bike to be as quiet as possible and everyone seems to be saying that the Silent Sport stuff is quieter and I think the manufacturer says it is 1.5dbs more quiet than fiberglass.

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