Magnaflow makes a great muffler and they sound good on a street car, but they are known to be relatively quiet, especially at idle. If you want to go louder and sound good, get yourself a pair of Flowmaster 40 Series Delta Force Race mufflers. I also have BBK LT's and ORH and with the FM Race 40 Series mufflers and it sounds awesome. It's going to be hard to dramatically make the idle much louder without going with bigger cams, but you can make it a little louder with those Flows.
I dont know, it all personal opinon really, but every GT around here runs Flowmasters and I guess I just like the sound of Magnaflow better. Im not saying Flowmasters are crappy just not my first choice. If I could do it over I think I would have bought all bassani but to late now.