After a lot of reading and listening to sound clips, I pulled the trigger on a Two Brothers carbon fiber slip on from Leclare PS. Here's the awesome thing- I ordered it on Tuesday, it arrived at my door Wednesday afternoon, with free shipping!
The removal of the old pipe wasn't much of a problem, even the rubber center stand bumper, just put some dish soap on it. The install of the new pipe was a breeze. I had to remove the rear bag guard to get to the potato launcher mount bolt, but that was no problem. The weight difference is amazing. The TBR might weigh 10lbs.
I really like the sound. Yes, its a good bit louder, but at idle and cruising speed, it's not bad. Wind it up to 8k, it screams. I think it gives the bike the "yes, I'm a high tech machine" sound. It reminds me of the 2:1 pipe my wife had on her late Vulcan, it had a nice rumble at idle, wasn't too loud at cruising speed, but when you got on it, you heard it well.
I posted a couple videos on youtube, a before and an after.
Before:
http://youtu.be/bsPGloSz0xAAfter:
http://youtu.be/q6U_IKFoeTs