Today out of curiosity I got out and measured the muffler on the Magnaflow full exhaust system (19430 with the black tips)
It's 22inches long
Overall the system is pretty mellow and tame! Get on it and you can hear it. It sorta hits a volume ceiling and stays there.
I really think from a sound level standpoint the magnaflow system hits a sweet spot for people who want to actually hear their hemi, without waking the neighbors or upsetting the wife.
People who haven't heard a stock setup before or know how quiet the 5th gen stock system is, are surprised to learn that it's not the stock system because the volume level is far from the ballpark of straightpipes (not that there's anything wrong with guys who like a straight pipe!)