I also have the flowmaster, it took a while to break it in (sounded like crap for a while) but after about 4 hrs of driving on the highway at 90 it heated it up nice, I think they sound awesome, no raspyness whatsoever, and it can be as loud or quiet as I want it to be, just depends on how far I want my foot to go....Also be carefull of your bumper, mine started to melt and I had it about 1" away from it...

Oh and I know this isnt my thread, but are you guys planing on puting a tip on it? I was thinkin about it, but I dont know?