Honda PA Exhaust (Stock) Cleaning (or what's inside this black box?)

From MopedWiki

Cleaning the Stock Exhaust

The service manual tells us to remove the bolt, and clean away. Note - if your tools is not at least 4-1/2" long, it won't reach far enough to do the job.

Others recommend (and I do too), putting the exhaust inside a pile of charcoal briquets (sp?) and then light them up. Wait until the muffler itself is glowing a nice red or red/orange, then take it out. After it has cooled down, then tap the exhaust on all sides, and the carbon can fall out.

What's Inside this Exhaust Anyway?

One Sunday afternoon, being bored, I thought - I'm going to cut apart an exhaust and find out what's inside. The following pictures speak for themselves.