Should my muffler be empty??

Installed my GYT-R insert this weekend. Had to remove the spark arrestor and turn it so the GYT-R would be right side up. I'm like that. Anyway, I don't have packing or anything inside my muffler. Just a great big empty can. Does anyone elses stock pipe have packing? :)

The packing is thin and unreplaceable behind a metal grid on the interior surface of the muffler. If you shine a light inside the muffler when you have the spark arrestor off you can see it.

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