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There are many theories as to it's function. It does slightly reduce exhaust noise, but there is also thought that it acts as an expansion chamber to help with high rpm flow. According to Harvey it is directly affected by resonant waves, and is specificly tuned for proper length, size, and distance from the exhaust manifold. While nothing has been proven on a dyno, it is thought that messing with this "resonator", or secondary muffler can have a slightly noticeable effect on the power curve.
I think to answer your question, it isn't simply some glasspack they threw on to make it more quiet. Trust me, I've removed mine and the primary muffler does a fantastic job for keeping the noise down.
I've replaced it with a pretty standard resonator with about the same volume.
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