I also have a Hooker Aerochamber. At idle its not loud and has a nice tone. During regular driving it has a nice deeper tone, but not loud. If you really get on it, its a bit loud, but not too bad. Nobody has ever called my truck loud, but a few have told me they like how it sounds. I'll see if I can make an audio of mine for you.
I'd recommend them, they have a nice sound.
I have stock 350, into Edelbrock emission headers, into y-pipe, 3" pipe to cat, 3" pipe to muffler, 3" pipe exits behind drivers rear tire.
http://www.holley.com/types/Aero%20Chamber.asp
BTW: KMK454, you have some bad ass rides!