and why does it not sound as loud as everyone is talking about. It's somewhat louder than stock and that's it. The ones I got were the orginal 40 Series 2 Chamber. It's supposed to be louder than the newer Delta Flow. Are the mufflers suppose to break-in and then become louder? I'm somewhat satisfied but no fully. The muffler guy that welded them in is really skilled and made sure everything was in tact and snugged. Could it be my mid-pipe? Thinking about getting the Mac Prochamber to compliment my flows. What do you guys think?