i had AT3030 on my 03 4.7l QC and LOVED IT!!! even my wife (GF at the time) loved it. no raspiness, excellent idle rumble
. could get a wee bit loud if you hit go pedal hard but i never complained. drove from Ellsworth AFB to my home in WI (800 miles), and never had an issue with it. actually enjoyed it more since i could get it to shift down on the good sized hills and wake up the neighborhood.
my brother loved hearing me pull into his town from about a mile out. he said there was no mistaking it. no other truck sounded that good around there. especially with all the stop signs i had to go through to get to his house.
My wife is patiently waiting for me to do the same to my current truck. gotta get some moolah, tho.
I haven't had Magnaflow yet, and I don't think I ever will cause everyone seems to have em. I like to be different.