Yes, they will fit.
Yes, they are a little quieter.
My 2010 pipes are quite loud. They do get louder as the miles build up without any modification. At 36,000 miles they have a nice deep sound, without being obnoxious.
2010 Vulcan Voyager 1700 ABS, 2007 Vulcan Mean Streak 1600
2012 Concours 1400, 2011 Versys 650, 2012 KLX250S
see my garage for list of accessories