Let's put it this way, if I keep the tach around 2k or less, the flowmaster is fine, above that it's loud and at WOT it's really loud, which judging by some of the posts here is what some people are really wanting! (hint hint, there will be a very gently used flowmaster for sale soon here)
Driving through the neighbourhood, leaving a stoplight, driving at cruising speeds, all of this I want to barely hear the muffler, once again, a little louder than oem is ok, when I'm goosing it, then yea, it's ok to hear some noise, I just don't want to hear it 90% of the time
The Borla customer service people were stating a turbo muffler would likely work, you remember if that's what you have?