Awesome man, if you like loud youll love them, They do have tone, an amazing one at that, just sounds like the classic 5.0 on steriods. Goodluck tell us how you like them.
Get some sounds clips, I wanna hear them with the xpipe.
And for decibel levels, they are very loud, advertised to be about 2-4db quieter then straight pipes, idle isnt much louder then flowmasters, but 2k and up is LOUD, and when you hit it you cant even describe it. Surprisngly highway cruising isnt bad. Honestly better then flowmasters, i took an hour drive on the highway the other day, with my 3.73 gears, put me cruising at about 2700 at around 80mph, and my ears didnt hurt at all, I was fine.
Heres a clip of mine.
http://media.putfile.com/slide-54