The rear section was too mute for me too... at least from inside the car. Outside the car, it actually sounds okay, but it made me get the full system to hear the whole system from inside. Then it was loud, because of the stinky no cat smell, I put on the Magnaflow HF cats, which made it just right....
2008 E90 AW
Exhaust: Innotech full system with magnaflow cats.