I have a Kazama, It seems to get louder :D with time but not over powering loud (you can have a conversation with your passenger on a motorway) It does have a nice deep sound, its a popular exhaust on here, Not heard too much about the Kazama 2.
Ebay has an exhaust called a Blueflame, a few people have mentioned these.
Come along to Fast Show at Santa Pod on sunday, will be a good few of us there then you can have a listen for yourself.