I have no idea why people think it's louder...
It's the same as the MAM was, and I don't remember anyone saying that one was loud. I've got stock back from it and before it, so the sound really hasn't changed at all, volume wise. Just a tad lower note. That's all. Wish I could get a nice quality sound file on it.
All this does is open up the exhaust system so the air flows free'er. Very nice, smooth, noticeable, power gain. Everyone always says, "I wish it was my first upgrade." It's true! Any exhaust system is most important for any turbo setup, whether it's stock or not. Along with good tuning...