Bill, the noise level is set by the EU and forms part of the MOT test. Too loud and they can fail the test. Most of us with louder pipes on keep a stock pair somewhere and stick them on for the test. Or find a nice garage that is ok with slightly louder notes from the back end....
Troutman, I've taken the back baffle out of my stock pipe and that is louder. It's also ok for the mot.
Gina
03 America - Pretty stock - except the TBS wheel...

06 America - missing, presumed in bits. With it's TBS wheel...

09 America - It's very blue....